题目内容
(请给出正确答案)
[单选题]
It suddenly_________to him that he had worked for twelve hours without eating anythin
A.A.happened
B.B.occurred
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A.A.happened
B.B.occurred
A.适当增大回流比
B.适当减小回流比
C.适当增大再沸器的加热量
D.适当减小再沸器的加热量
A.小于152.4mm井眼,Rt/Rm<7000
B.小于203.3mm井眼,Rt/Rm<2000
C.小于304.8mm井眼,Rt/Rm<1000
D.小于304.8mm井眼,Rt/Rm>1000
A.适当增大飞行速度
B.适当减小飞行速度
C.适当降低飞行高度
D.适当增大飞行高度