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【多选题】
同普通钢筋混凝土梁比较，预应力混凝土构件（ ）A.
可节约钢材
B.
可提高抗裂能力
C.
可提高延性
D.
可提高结构刚度
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【单选题】On a vertical machining center, if the Z-axis is vertical, up is usually( )。
A.
Negative
B.
Positive
C.
Left
D.
Right
【单选题】An ILS consists of two independent sub-systems, one providing _____ guidance (Localizer), the other _____ guidance (Glide slope or Glide Path) to aircraft approaching a runway. A. lateral, lateral ...
A.
lateral, lateral
B.
lateral, vertical
C.
vertical, lateral
D.
vertical, vertical
【单选题】Aboard ship, vertical flat plates running transversely and connecting the vertical keel to the margin plates are called ______.
A.
floors
B.
intercostals
C.
girders
D.
Stringers
【单选题】A single vertical magnet placed underneath the compass in the binnacle is used to compensate for ______．
A.
The horizontal component of the permanent magnetism
B.
Deviation caused by the vessel's inclination from the vertical
C.
Induced magnetism in the horizontal soft iron
D.
Induced magnetism in the vertical soft iron
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