不定项选择

电容耦合或者互感耦合只有变化的电场和磁场才能产生。

A．正确
B．错误

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单项选择题

‌已知钨的熔点为3380℃，在1000℃对其进行压力加工，该加工（）。

A．属于热加工
B．不是热加工或冷加工
C．属于冷加工
D．无法确定

单项选择题

Why people celebrate Halloween? A.
To celebrate the summer is coming.

B.
To celebrate the new year is coming.

C.
It’s the beginning of the dark, cold winter that was often associated with human death.

D.
It’s the end of winter, people want to welcome spring.