室外蝶形引入光缆与电力线(220V电力线)交叉间距不得小于()cm。跨越障碍物不得有托磨现象,否则应加以保护。
参考答案:40
The natural beauty of Mount Tai _______millions of tourists from all over the world every year.
A.encourages
B.attracts
C.reminds
D.seizes
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