题目内容

下列几何形状中()吸声效果最好

A. 圆柱形
B. 圆锥形
C. 球形
D. 正方形

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当悬挂的吸声体面积与室内所需噪声治理面积之比为()左右时，其吸声效率最高

A. 10%
B. 25%
C. 50%
D. 70%

链传动是借助链和链轮间的( )来传递动力和运动的

A. 摩擦
B. 粘接
C. 啮合
D. 摩擦和粘接

Betsy earned a teaching ( ) from San Jose State University.

A. qualification
B. quantity
C. certificate
D. proof

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A. deriving
B. acquiring
C. rewarding
D. benefiting