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【单选题】
图中所示为分别为定位销和销支座标准件,如定位孔为Φ7.1,定位销尺寸D为Φ7.0, L取10,则定位销的总长为( ),销支座上两圆柱销孔之间的距离为( )。 A 52, 80 B 52, 40 C 50.5, 40 D 50.5, 80
A.
B.
C.
D.
D
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举一反三
【单选题】In the last two hundred years there have been great changes in the method of production of goods. This is now also true of the building industry; for mechanization has been introduced. System building...
A.
the latter uses ready-made internal features
B.
panels are cast in a level position
C.
the former is used to build walls and floors while the latter to construct bathrooms or bedrooms
D.
the former is more expensive than the latter