固位形窝洞的制备要求之一为()
A.洞形应做成浅而敞开
B.尽量多做倒凹形固位
C.单面洞应用鸠尾固位
D.底平壁直的盒状洞形
E.点、线、角清晰锐利
参考答案:B
“Stop thief! Stop thief!” But the thief was ________ by the crowd and we lost sight of it.
A.drowned
B.swallowed
C.caught
D.stopped
以下选项中不能作为合法常量的是______。
A.12340
B.1.234e0.4
C.12340
D.1.234