电磁调速电机停车时,要将()器旋钮归零后,再关闭电源。
A.调速
B.电位
C.联接
D.控制
参考答案:B
看图写单词。
1.2. 3.
_____________ _____________ ____________
4. 5. 6.
_____________ ______________ ____________
—Can I help you,sir?
—Yes,I bought this radio here yesterday,but it______.
A.didn’t work
B.won’t work
C.can’t work
D.doesn’t work