与()轴承相配合的轴颈,表面粗糙度应为Ra0.16。
A. 圆柱滚子
B. 闽锥滚子
C. 推力球
D. 滚针
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If I get the new job, I()buy a better car.
A: 不填
B: will
C: would
D: might
She has brought()two children by herself.
A: 不填
B: up
C: on
D: away
– The lecture given by professor Smith was really interesting. – ().
A: I couldn't agree with you more
B: I'm going to listen to it
C: It sounds reasonable
D: It didn't last too long
正常2周岁的小儿,身高为
A. 81cm
B. 83cm
C. 85cm
D. 87cm
E. 84cm