活塞环槽端面磨损不仅使其活塞环的平面间隙增大，使P，和P：下降，还会使（）。
A．环的弹力下降
B．环折断
C．环的密封性下降
D．环磨损
参考答案：B
如图所示的局面中魏国都于
三国鼎立示意图
A．长安
B．建业
C．成都
D．洛阳
—In my opinion, China has more _____ to deal with the disease of A/HINl.
—I quite agree with you. Chinese medicine works well. [ ]
A. advantages
B. interests
C. equipments
D. materials
