下列仪器不能用作化学反应容器是( )
A.集气瓶
B.烧杯
C.锥形瓶
D.量筒
答案:D
I'm sorry I didn't hear you clearly. _____ you repeat that, please?[ ]
A. Could
B. May
C. Must
D. Need
对任何一个行业的从业人员来说,最基本的职业道德是()。
A.诚实信用
B.勤勉尽责
C.守法遵规
D.专业胜任