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【单选题】
未饱和空气(露点15°C)在与水隔绝的条件下定压从25°C降温至20°C,湿空气中干空气分压强_______,水蒸汽分压强_______。A.
升高/降低
B.
降低/升高
C.
升高/不变
D.
不变/不变
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皮皮学刷刷变学霸
举一反三
【单选题】(单选)有一外径为18mm的无缝钢管,管内通冷冻盐水,为减少冷量损失,在管外包一层导热系数λ=0.18W/(m·°C)的石棉,保温层外壁与空气对流给热系数α=10W/(m2·°C),比较石棉厚为5mm和8mm时的冷量损失:
A.
5mm时损失较大
B.
8mm时损失较大
C.
一样大
D.
不好说
【单选题】We have done things we ought not to have done and______ undone things we ought to have done.
A.
leave
B.
leaving
C.
left
D.
will leave
【单选题】What a pity ! Considering his ability and experience , he ____better. A . need have done B.must have done C. can have done D . might have done
A.
A . need have done
B.
must have done
C.
can have done
D.
D . might have done
【简答题】All that can be done _____. [ ] a. has done b. has been done c. have done d. have been done
【简答题】在“体检中心”页面,可以很醒目的看到目前店铺急需处理的()()()和待跟进申诉等。
【单选题】We have done things we ought not to have done and ________ undone things we oughtto have done.
A.
left
B.
leave
C.
willleave
D.
leaving
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