【单选题】下列哪些材料可以直接放在正置光学显微镜下观察( )
【单选题】"John is single" ____ "John is married".
【单选题】在()两种干燥器中,固体物料和干燥介质呈悬浮状态接触。
【单选题】在( )两种干燥器中,固体物料和干燥介质呈悬浮状态接触。
【单选题】Does John Walker want to get married quickly?
A.
Yes, he is dating someone from work.
B.
Yes, he is very serious.
C.
No, he is not in a hurry to get married.
【单选题】John, a friend of mine, who got married only l
A.
12. John, a friend of mine, who got married only lastweek, spent $3,000 more than he _______ for the wedding. ( 全国 3) A. will plan
【多选题】在( )干燥器中,固体物料和干燥介质呈悬浮状态接触