动铁式弧焊变压器当手柄顺时针旋转铁心向里移动时电流减小。( )_爱下问搜题

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问题判断题

动铁式弧焊变压器当手柄顺时针旋转铁心向里移动时电流减小。( )

答案

参考答案：对

选择题

—_____ in summer here?

—It's not very hot. [ ]

A. What's the weather

B. What's that

C. Where's the weather

D. How's the weather

问答题

简述关键事件法的定义及优缺点。