搜题
王老师:19139051760(拨打)
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第1题

( ) makes his shop different is that it offers more personal services.
· What
· Who
· Whatever
· Whoever
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第2题

For many cities ithe world, there is no room to spread out further, ( ), New York is aexample.
· for which
· of wh
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第3题

Why not try your luck downtown, Bob That’s ( )the best jobs are.
· that
· what
· where
· which
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第4题

带二极管整流器的 SPWM 变频器是以正弦波为逆变器输出波形,是一系列的( )矩形波。
·幅值不变,宽度可变
·幅值可变,宽度不变
·幅值不变,宽度不变
·幅值可变,宽度可变
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