—OK. I will do it right away.
A:Give it away
B:Put it away
C:Put it out
D:Run it away
There are __________ books on the desk.
如图所示的电路,若想让两灯组成并联电路,需要闭合的开关是( )
—Sure. I'm confident about ____.
需经过称量、溶解、转移、定容等操作.下列图示对应的操作规范的是( )