题干
23. We went into a hall, on_____walls hung a few pictures of some famous scientists.
A：it
B：which
C：whose
D：Those
答案(点此获取答案解析）
C
A：it
B：which
C：whose
D：Those
当甲池电极析出6.4gCu时，乙池电极析出21.6g金属，则乙池的溶质可能是（ ） 