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采煤工作面必须保持至少几个畅通的安全出口？

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SECTION B ENGLISH TO CHINESE
Directions: Translate the following text into Chinese.
The days of his youth appeared like dreams before him, and he recalled the serious moment when his father placed him at the entrance of the two roads--one leading to a peaceful, sunny place, covered with flowers, fruits and resounding wit soft, sweet songs; the other leading to a deep, dark cave, which was endless, where poison flowed instead of water and where devils and poisonous snakes hissed and crawled.
He looked towards the sky and cried painfully, "O youth, return! O my father, place me once more at the entrance to life, and I'll choose the better way!" But both his father and the days of his youth had passed away.

下列()属于工程因素。

A. 地应力
B. 支护条件
C. 地下水

Over recent years, Canada has faced several ______ by countries such as the United States,

Where can we see economies in which women do all the hard work while men sit around enjoying themselves？