多项选择题

一个孔或轴允许的尺寸的两个极端，称为下列哪些尺寸？
A、上极限尺寸
B、公称尺寸
C、下极限尺寸
D、提取实际要素的局部尺寸

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单项选择题

Which of the following statements is TRUE regarding automatic identification systems（AIS）________．A.AIS cannot be used to make passing arrangements because the system is not capable of this type of ship-to-ship communicationsB.AIS cannot be used to make passing arrangements because the ship-to-ship text messaging feature is for emergency use onlyC.AIS can be used to make passing arrangements via ship-to-ship text messaging but a vessel operator is not relieved from the requirement to sound whistle signals or make arrangements via bridge-to-bridge radiotelephoneD.AIS can be used to make passing arrangements via ship-to-ship text massaging thus relieving a vessel operator from making such arrangements via bridge-to-bridge radiotelephone or signaling intent to pass via whistle signals

A.A.AIS
B.AIS
C.AIS
D.AIS

单项选择题

判断图示结构为几次超静定？

A.3次
B.4次
C.5次
D.6次

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