普通23t轴重货车重车位铸铁闸瓦换算闸瓦压力为330kpa,空车位铸铁闸瓦换算闸瓦压力为()kpa。
A. 130
B. 150
C. 300
D. 330
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Each person at the reunion was required to talk to other relatives to find out if they would buy one of the histories()it were printed.
A. whether
B. if
C. when
D. after
计量经济学方法不是计划工作方法。
A. 正确
B. 错误
钢琴属于下列哪种乐器()
A. 拨弦乐器
B. 弓弦乐器
C. 击弦乐器
D. 键盘击奏弦鸣乐器