多项选择题

在选择电力变压器分接头和调压方式时，下列哪些规定是正确的？（）

A.分接头设在高压绕组或中压绕组上
B.分接头在网络电压变化最大的绕组上
C.分接头应设在三角形连接的绕组上
D.无励磁分接开关应尽量减少分接头的数量

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根据下列文章,请回答 26～30 题。Text 2More than 30,000 drivers and passengers who sit in the front of the vehicles are killed or seriously injured each year. At a speed of only 30 miles per hour it is the same as falling from a third floor building. Wearing a seat belt saves lives:it reduces your chance of death or serious injury by more than a halF.Therefore drivers or front seat passengers over 14 in most vehicles must wear a seat belt. If you do not, you will be fined up to ￡50. It will not be up to the drivers to make sure you wear your belt. But it will be the driver's responsibility to make sure that children under 14 do not ride in the front unless they are wearing a seat belt of some kinD.However, when you're reversing your car, you do not have to wear a seat belt;or when you are making a local delivery or collection using a special vehicle ; or if you have a valid medical certificate which excuses you from wearing it. Make sure these circumstances apply to you before you decide not to wear your seat belt. Remember that you may be taken to court for not doing so, and you may be fined if you cannot prove that you have been excused from wearing it.第 26 题 How many people in the front of the vehicles are killed or seriously injured every year?A.30,000.B.60,000.C.Approximately 30,000.D.Above 30,000.

A.Therefore
B.
However,
C.30,000.
B.60,000.
C.Approximately
D.Above

单项选择题

导线张力与其单位长度质量之比T m可确定导线的微风振动特性，架空线路在B类地区（指一般无水面平坦地区）的单导线，当档距不超过500m时，在最低气温月的气温条件下，档中安装2个防振锤，导线的T m比值在什么范围是安全的？（）

A.19500～20500m2/s2
B.21500～22500m2/s2
C.16900～17500m2/s2
D.17500～19500m2/s2

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