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问题
单项选择题
飞机水平转弯过载大小与（）
A.转弯速度有关
B.发动机拉力有关
C.转弯坡度有关
答案
参考答案：
C
选择题
Sales of CDs have greatly increased since the early 1990s, when people _______to enjoy the advantages of this new technology.
A. begin
B. began
C. have begun
D. had begun
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单项选择题
国产冷冻机油要求的含水量为（）。
A.1mg/kg
B.5mg/kg
C.10mg/kg
D.0
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