为补偿金瓷全冠的金属收缩，在基牙上要涂布
A．分离剂B．石膏强化剂C．间隙涂料D．液状石蜡E．蜡
参考答案：C
I thought we'd be late for the concert, _____ we ended up getting there ahead of time. [ ]
A. but
B. or
C. so
D. for
配合接头按其作用可分为常用接头和（）接头。
A.特殊
B.一般
C.钻杆
D.钻头
