当被连接件之一比较厚,不宜做成通孔,且需要经常拆装时,往往采用。
A. 螺栓连接
B. 双头螺柱连接
C. 螺钉连接
D. 紧定螺钉连接
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具有定位功能的螺纹连接是。
A. 普通螺栓
B. 铰制孔螺栓
C. 紧定螺钉
D. 双头螺柱
For the dinner, we usually pay tips around _______ of the bill.
A. 5%
B. 18%
C. 50%
D. 80%
John _______ to waiters every time he is satisfied with the service.
A. tip
B. tips
C. tipping
D. tippd
We paied 20 dollars as the _____(tip) to the waiter.