判断题

在内力符号的右下方用两个下标注明，第一个下标表示该内力所属的截面；第二个下标表示杆件(或杆段)的另一端截面。

答案：正确

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What does the author say about global wildfire incidence over the past 70 years?
A、It has got worse with the rise in extreme weathers.
B、 It signals the early stages of global warming.
C、It has dropped greatly.
D、It is related to drought.

答案： It has dropped greatly.

根据输出电平数的不同，电压源型牵引逆变器又可分为两电平和三电平两种。
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答案：正确