Mr White, ______ my mother.[ ] A. it is_爱下问搜题

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问题选择题

Mr White, ______ my mother. [ ]

A. it is

B. this is

C. this

D. that

答案

答案：B

实验题

如图6-13所示是等离子体发电机的示意图，磁感应强度为B，两板间距离为d，要使输出电压为U，则等离子的速度为_______，a是电源的_______极.

图6-13

单项选择题

Forecastle deck is located in the ship’s（）.

A.bow stem

B.stern

C.portside

D.starboard side