当选用多台泵并联使用时,应在每台泵的出口装设( ),以防止出水由停用水泵中短路回流。
A. 蝶阀
B. 闸阀
C. 止回阀
D. 截止阀
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在制冷机房设计中,一般考虑设置的机组台数为( )。
A. 6台以上
B. 1台
C. 2-3台
D. 4-5台
Internship is to earn peanuts.
A. 对
B. 错
The college students can gain experience and contacts through internship.
A. 对
B. 错
Doing internship is not a really good way of building valuable contacts in the choose field.
A. 对
B. 错