单项选择题
25HZ轨道电源屏中当出现( )时，变频器均无输出，此时应停机检查。
A、变频器2次侧二极管击穿
B、断线或谐振电容断线
C、输入端短路
D、负载过小
25HZ轨道电源屏中当出现( )时，变频器均无输出，此时应停机检查。
A、变频器2次侧二极管击穿
B、断线或谐振电容断线
C、输入端短路
D、负载过小
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The young lady coming over to us （） our English teacher; the way she walks te
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A.must be
B.can be
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How exciting! I drove my new car at a speed of 110km/h on Sunday morning.
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A.must have killed
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不定项选择
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A．错误
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A.
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B.
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C.
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D.
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单项选择题
It’s been a wonderful evening. Thank you very much.
It’s been a wonderful evening. Thank you very much.
A.My pleasure.
B.It doesn’t matter.
C.No, thanks.
D.It’s Ok.