判断题

剖切方向线，用两段粗实线表示剖切后的投影方向，线段长约6~10mm。

答案：错误

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不定项选择

涡旋电场是由变化的磁场激发的。

A．正确
B．错误

单项选择题

What happened to his family after the atomic explosion?
A、His youngest sister survived.
B、His mother was with his younger brother and younger sister.
C、His mother and elder sister were missing
D、He lost 5 family members.