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【判断题】
氢气的爆炸极限是：4%～75%。()A.
正确
B.
错误
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【单选题】' They laughed when I sat down at the piano, but when I started to play . . . ! ' These words may be among the most successful in advertising history. Although the ad has not run for many years, the s...
A.
surprising you
B.
describing a humorous situation
C.
ridiculing someone
D.
appealing to people's dreams of personal success
【简答题】Translate into Chinesewhen they sat down, a faint dust rose sluggishly about their thighs, spinning with slow motes in the single sun-ray.
【单选题】In the army, Edward said that they were always pressed for time. Normally, they would have only ___________to eat every meal. So, as soon as they sat down, their five minutes started.
A.
five minutes
B.
six minutes
C.
seven minutes
D.
eight minutes
【简答题】只有现值没有终值的年金是( )。 A.永续年金 B．先付年金 C．后付年金 D．延期年金
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