A:饱和碘水和CCl4加入分液漏斗中后,塞上上口部的塞子,用一手压住分液漏斗上口部,一手握住活塞部分,把分液漏斗倒转过来振荡
B:静置,待分液漏斗中液体分层后,先使分液漏斗内外空气相通(准备放出液体)
C:打开分液漏斗的活塞,使全部下层液体沿承接液体的烧杯内壁慢慢流出
D:最后继续打开活塞,另用容器承接并保存上层液体
下列关于HIV、幽门螺杆菌、人体肿瘤细胞的叙述,正确的是( )
下列有关课文说法有误的一项是( )。
用所给单词的适当形式填空
①He was one of the best____ in yesterday’s football match.(play)
②More and more____ have come to visit China over these years.(foreign)
③She hoped that her son would become a____.(music)
④The teacher was pleased with her____.(honest)
⑤The mother didn’t know why her daughter was crying____.(noise)