如果被除数扩大为原来的3倍,要使商不变,除数应该( )。
扩大为原来的3倍
He opened his mouth as if _______ something. [ ]
A. saying
B. said
C. to say
D. be said
技师制作贵金属烤瓷全冠,其金属基底冠打磨完成喷砂粗化时应选用
A.50~100μm氧化铝砂
B.35~50μm氧化铝砂
C.50~100μm石英砂
D.35~50μm石英砂
E.150~200μm氧化铝砂