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【单选题】
下列不是齿轮传动的特点的是( ) 答案A.
能保证瞬时的传动比,传动平稳性好,传递运动准确可靠
B.
传递的功率和速度范围大,传动效率高,但其制造和安装精度要求也高
C.
结构紧凑,工作可靠,使用寿命长,不适宜中心距较大的场合
D.
工作时会有一些噪声,但能实现无级变速
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C.
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D.
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A.
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A.
She was badly ill.
B.
She forgot the lesson.
C.
Her mother was ill.
D.
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