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【单选题】
关于铝合金外窗框与砌体墙体固定方法，下列各项错误的是（ ）。A.
门窗框上的拉接件与洞口墙体的预埋钢板焊接
B.
射钉固定
C.
墙体打空那个砸入钢筋与门窗框上的拉接件焊接
D.
金属膨胀螺栓固定
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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】（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，在管外包一层热导率λ=0.18W/(m·℃)的石棉，保温层外壁与空气对流给热系数α=10W/(m2·℃),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 found that the plane_____ when we got to the airport.
A.
already took off
B.
had already taken off
C.
was already taking off
D.
was already taken off
【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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