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【单选题】
下列关于通行地沟敷设说法错误的是（）。A.
当热力管道通过不允许挖开的路面处时，可以考虑采用通行地沟敷设
B.
当热力管道数量多或管径较大，管道垂直排列高度≥2m时，可以考虑采用通行地沟敷设
C.
通行地沟敷设方法的优点是维护管道方便，缺点是基建投资大、占地面积大
D.
在通行地沟内布置管道有单侧和双侧两种方法
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【简答题】Although they plant trees in this area every ?Although they plant trees in this area every year, the tops of some hills are still _______. A) blank B) hollow C) vacant ...
【单选题】Although they plant trees in this area every year, the tops of hills are still ______.
A.
blank
B.
hollow
C.
vacant
D.
bare
【单选题】Although they plant trees in this area every year, the tops of some hills are still
A.
blank
B.
hollow
C.
vacant
D.
bare
【单选题】Although they plant trees in this area every year, the tops of some hills are still ______.
A.
bare
B.
empty
C.
blank
D.
vacant
【单选题】They plant fruit __________ vegetables on their farm. [ ]
A.
but also
B.
as well as
C.
as well
【单选题】Although they plant trees in this area every year, the tops of some hills are still _____. [ ]
A.
blank
B.
bare
C.
solid
D.
rare
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