()的主要成分是医用石膏粉。
A.软膜
B.膏状面膜
C.硬模
D.矿泥面膜
参考答案:C
Beijing is the capital of China and it is one of ______ cities in the world.
A.big
B.bigger
C.biggest
D.the biggest
模板支架立柱间距通常为()。
A.0.4—0.8
B.0.8—1.2
C.1.0—1.4
D.0.5—0.8