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【判断题】
在剖视图中，内外螺纹旋合的部分按内螺纹画法绘制。A.
正确
B.
错误
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【简答题】As we all know, some people get thirsty not for water. They are thirsty to ____a dream or to make something different. I think it is those people who are eager for ____ with an unquenchable (不能磨灭的) th...
【单选题】根据下面材料，回答题。 A Thirsty World The world is not only hungry, it is also thirsty for water. This may seem strange to you, since nearly 75% of the earth&39;s surface is covered with water. But about 97% of...
A.
A limited water supply
B.
so that it can be used again just as if it were fresh from a spring
C.
It is possible to purify large amounts of sea water
D.
But even if every large city purified and reused its water
E.
And we cannot even use all of that
F.
Experiments have already been done in this field
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