问题
选择题
Though this question is very difficult, if you ________ trying you will find the right answer.[ ]
A. keep up
B. keep on
C. keep out
D. keep off
答案
答案：B
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Though this question is very difficult, if you ________ trying you will find the right answer.[ ]
A. keep up
B. keep on
C. keep out
D. keep off
答案：B
2C达到平衡时，增大压强，C的量减少，则下列结论符合该平衡的是（ ）