多项选择题

根据《劳动法》的规定，用人单位不得安排未成年人从事()、国家规定的第四级体力劳动强度的劳动和其他禁忌从事的劳动。

A.矿山井下
B.汽车维修
C.机械加工
D.有毒有害
E.家电维修
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Theft deterrent systemTo deter the vehicle theft, the system is designed to give an alarm and keep the engine from being started if any of the front, sliding and back doors and hood is forcibly unlocked or the battery terminal is disconnected and then reconnected when the vehicle is lockeD.The alarm blows the horn intermittently and flashes the headlights, tail lights and other exterior lights. The engine cannot be started because the starter circuit will be cut.SETTING THE SYSTEM1. Turn the ignition key to the 'LOCK' position and remove it.2. Have all passengers get out of the vehiclE.3. Close and lock the front, sliding and back doors and hooD.The indicator light will come on when the front, sliding and back doors and hood are closed and lockeD.As the front doors arc locked, the system will give you a preparation time of 30 seconds before the setting, during which the front, sliding and back doors and hood may be opened to prepare for the set- ting.Be careful not to use the key when opening either front door. This will cancel the system.4. After making sure the indicator light starts flashing, you may leave the vehiclE.The system will automatically be set after the preparation time elapses. The indicator light will flash to show the system is set. If any of the front, sliding and back doors and hood is opened at that time, the setting is interrupted until it is closed and lockeD.Never leave anyone in the vehicle when you set the system, because unlocking from the inside will activate (使起动) the system.WHEN THE SYSTEM IS SETActivating the systemThe system will give the alarm and cut the starter circuit under the following conditions:If any of the front, sliding and back doors and hood is unlocked without using the keyIf the battery terminal is disconnected and then reconnectedAfter one minute, the alarm will automatically stop with the starter circuit cut kept on.Reactivating the alarmOnce set, the system automatically resets the alarm each time the front, sliding and back doors and hood are closed after the alarm stops.The alarm will be activated again under the following conditions:If any of the front, sliding and back doors and hood is openedIf the battery terminal is disconnected and then reconnectedStopping the alarmTurn the ignition key from the 'LOCK' to 'ACC' position. The alarm will be stopped with the starter eircuit cut kept on. Stopping the alarm in this manner will keep the alarm from being reactivated when any of the front, sliding and back doors and hood is openeD.Interrupting the settingWith the system set, the back door can be opened with the key without activating or canceling the system. While it is open, the front and sliding doors and hood may be opened in addition, and the system can be activated only by the battery terminal disconnection.To resume the setting, close and lock the front, sliding and back doors and hooD.The back door must be closed with the key removeD.CANCELLING THE SYSTEMUnlock either front door with the key, or unlock the sliding door with the key when it has been closeD.This cancels the system completely and the starter circuit cut will be cancelled at oncE.INDICATOR LIGHTThe indicator light gives the following three indications when the system is in usE.When the light is:FLASHING—The system is set. You need the key to open the front, sliding and back doors and hooD.ON—The system will automatically be set when the time comes. The front, sliding and back doors and hood may be opened without a key.OFF—The system is inactivE.You may open any door and hooD.TESTING THE SYSTEM1. Open the driver's and front passenger's windows.2. Set the system as described abovE.The front doors should be locked wiA.YB.NC.NG
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In addition to the established energy sources such as gas, coal, oil and nuclear, there are a number of other sources that we ought to consider. Two of these are hydroelectric and tidal power.These two sources are【21】______ in that they are both renewablE.【22】______ , hydropower is more widely used than tidal. In【23】______ , a substantial amount of electricity is already produced in HEP (hydroelectric power)stations worldwide, 【24】______ tidal stations are still in the very early【25】______ of development.As far as geographical【26】______ is concerned, HEP projects are to be found on lakes and rivers, while tidal【27】______ are constructed only at river mouths where tidal【28】______ is great. Unfortunately these are【29】______ in number. At present HEP stations are found mainly in Norway, Canada, Sweden and Brazil, whereas tidal plants are in【30】______ in France, Russia and ChinA.As regards capital【31】______ , both require very high investment. On the other hand, generating【32】______ are quite low in both cases. In fact, a large scale HEP plant is capable of producing power more【33】______ than conventional sources, such as coal, oil and nuclear plants. Tidal power also compares【34】______ with nuclear and oil generated electricity, 【35】______ the amount of money on production. 【36】______ HEP stations, tidal constructions have a long life【37】______ . It is estimated that they can operate for over 100 years. With respect to【38】______ of supply, tidal stations【39】______ from HEP ones in that they often can only supply power【40】______. HEP stations, however, pro vide a constant supply of electricity.【21】A.compatibleB.parallelC.similarD.identical
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