下列有关化学实验的操作中，一般情况下不能相互接触的是( )。
| A．过滤操作中，玻璃棒与三层滤纸 |
| B．过滤操作中，漏斗颈下端与烧杯内壁 |
| C．分液操作中，分液漏斗颈下端与烧杯内壁 |
| D．用胶头滴管向试管滴加液体时，滴管尖端与试管内壁 |
相关试题
If you leave the club, you will not be_____back in .
| A．received | B．admitted | C．turned | D．moved |
What I need is_____ book that contains ______ABC of oil painting.
| A．a; 不填 | B．the; 不填 | C．the; an | D．a ; the |
Jenny nearly missed the flight______ doing too much shopping.
| A．as a result of | B．on top of | C．in front of | D．in need of |
The CDs are on sale! Buy one and you get ______ completely free. 
| A． | other | B． | others | C． | one | D． | ones |
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