选择机组容量时，应使机组的运行功率不大于标定功率，同时要考虑用户经常出现的最低负荷，使该负荷不小于一台机组的( )。
A. 50%
B. 40%
C. 30%
D. 20%
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The writer implies-that this world plan is to be （）
A. carried out in the major areas of illiteracy like Africa
B. realized in ten years
C. made by experts in Paris
D. discussed at an international conference
I bought a new house last year, but I ______ my old house yet, so at the moment I have two houses.
A. did not sell
B. have not sold
C. had not sold
D. do not sell
When ______ our sports meet is still a question.
A. shall we have
B. do we have
C. did we have
D. we shall have
The kind of examinations in which students must select answers is （）
A. subjective
B. spoken
C. objective
D. informal
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