测定室内空气中菌落总数时,应将采样器消毒。
参考答案:对
—What a beautiful purse! Can you tell me ________?
—Sure, in Wuhan Plaza. [ ]
A. where did you buy it
B. where you bought it
C. when did you buy it
D. when you bought it
尖叶番泻叶基部的特点是()
A.基部心形
B.基部楔形
C.基部戟形
D.基部不对称
E.基部下延成翼状