问题
选择题
______you practise more _______speak fluent English. [ ]
A. If only; can you
B. Only if; you can
C. Only if; can you
D. If only; you can
答案
答案：C
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______you practise more _______speak fluent English. [ ]
A. If only; can you
B. Only if; you can
C. Only if; can you
D. If only; you can
答案：C
H++Ac-的电离平衡中，要使电离平衡向左移动，应采取的措施是（ ）