问题
选择题
Walking exercises ____ be boring at times, but on a clear sunny morning nothing could be better. [ ]
A. may
B. will
C. must
D. should
答案
答案：A
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Walking exercises ____ be boring at times, but on a clear sunny morning nothing could be better. [ ]
A. may
B. will
C. must
D. should
答案：A
（在反应前后La、Ni的化合价为0），其电池的反应通常表示为：
LaNi5+6Ni(OH)2