题干
— my ruler?
— It's on the desk.
A：Where
B：Where's
C：Who's
答案(点此获取答案解析）
B
— my ruler?
— It's on the desk.
A：Where
B：Where's
C：Who's
OH－＋H+ ，在25℃、35℃时其离子积分别为K（25℃）=1×10-14 、K（35℃）=2.1×10-14 。则下列叙述中正确的是（ ）