7655型凿岩机由冲击机构、（）、排粉机构、气腿、注油器、操纵装置组成。
参考答案：转钎机构
The teapot ______ for keeping tea hot after it ______.[ ]
A. was using; was made
B. was used; was made
C. using; is making
D. uses; makes
十五大报告指出，党和国家事业顺利发展的必然要求是（）。
A.高举邓 * * 理论伟大旗帜
B.坚持四项基本原则
C.坚持有法可依、有法必依、执法必严、违法必究
D.深入开展 * * 败斗争
