We can't hear clearly. Can you speak as ____ (loudly) as possible.
检验某未知溶液中是否含有Cl﹣的方法是:取少量某未知溶液于试管中,先滴入几滴稀HNO3,然后加入什么试剂( )
下面可以填哪些数?
5____276≈5万
下列说法正确的是( )