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【单选题】
电动坐椅的传动装置由( )、联轴节、软轴、螺旋千斤顶及齿轮传动机构组成
A.
A 减速器
B.
B 电动机
C.
C 变速器
D.
D 弹簧
参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】In its early history, Chicago had floods frequently, especially in the spring, making the streets so muddy that people, horses, and carts got stuck. An old joke that was popular at the time went somet...
A.
horses were fairly useful in Chicago
B.
Chicago"s streets were extremely muddy
C.
Chicago was very dangerous in the spring
D.
the Chicago people were particularly humorous