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问题 单项选择题

下列（）是造成万向传动装置异响的原因。

A、传动轴各连接处凸缘连接处松动

B、中间支撑轴承支架安装偏斜

C、万向节十字轴装配过紧，转动不良

D、传动轴动不平衡

答案

参考答案：A

判断题

抄表员在抄表时，客户提出改变电价类别，抄表员应立即在现场核实，帮助办理变更手续。（）
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选择题

Not only _____ polluted, but _____ crowded. [ ]

A. was the city; were the streets 　

B. the city was; the streets were 　

C. was the city; the streets were 　

D. the city was; were the streets

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