题目内容

He failed in the final exam. His father then stopped sending him money. (用once改写句子), his father stopped sending him money.

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The tennis star showed up. All the students then pushed forward to greet her.(用once改写句子)

动车组通过受电弓接收接触网( )的高压电,再经过用电设备变换后,供动车组设备使用。

A. 25KV
B. 35KV
C. 45KV

而动车组辅助供电系统就是指( )提供电能的系统

A. 牵引电机
B. 除为牵引供电系统之外的所有需要用电的负载设备
C. 只有空调

CRH3型动车组由( )对称布置牵引单元组成。每个牵引单元由一个头车、一个变压器车和两个中间车组成。

A. 4个
B. 3个
C. 2个

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