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【单选题】
网架结构支座一般设计成( )支座,且支座沿水平方向可有一定的位移。
A.
B.
C.
铰接
D.
都可以
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参考答案:
举一反三
【判断题】滚珠丝杠螺母副消除轴向间隙的目的主要是 为了减小摩擦力矩。
A.
正确
B.
错误
【单选题】滚珠丝杠螺母副消除轴向间隙的目的主要是
A.
减小摩擦力矩
B.
提高使用寿命
C.
提高反向传动精度
D.
增大驱动力矩
【单选题】奶牛发生慢性结核病,形成的结核结节属于()
A.
变质性炎
B.
渗出性炎
C.
增生性炎
D.
坏死性炎
E.
以上都不是
【单选题】奶牛发生慢性结核病,形成的结核结节属于( )。
A.
变质性炎
B.
渗出性炎
C.
增生性炎
D.
坏死性炎
E.
浮膜性炎
【单选题】听力原文: For many years, T-shirts were short sleeved undershirts only for men and boys. T-shirts used to be of one color--white. And since they were worn under shirts, they were generally not seen. Today...
A.
When they take part in sports.
B.
When they watch a film.
C.
When they go shopping.
D.
When they read a hook.
【单选题】听力原文: For many years, T-shirts were short sleeved undershirts only for men and boys. T-shirts used to be of one color—white. And since they were worn under shirts, they were generally not seen. Today ...
A.
When they take part in sports.
B.
When they watch a film.
C.
When they go shopping.
D.
When they read a book.
【判断题】在幻灯片中插入声音指播放幻灯片的过程中一直有该声音出现。
A.
正确
B.
错误
【单选题】滚珠丝杠螺母副消除间隙的主要目的是( )。
A.
减小摩擦力矩
B.
提高反向传动精度和轴向刚度 c. 增大驱动力矩 D. 提高使用寿命
【单选题】Choose the best function which is most suitable for the following excerpts taken from a sales letter. Bear in mind that we have manufactured T-shirts ever since 1900 and are quite confident that you w...
A.
Arouse interest
B.
create desire
C.
carry conviction
D.
induce action
【判断题】滚珠丝杠螺母副消除轴向间隙的目的主要是减小摩擦力矩。
A.
正确
B.
错误
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