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【单选题】
冲件料厚小于 1.5mm 时,汽车覆盖件修边冲孔模外购标准件中,结合企业实际,冲孔凹模镶套高度一般统一取( ) mm 。 A. 16 B. 20 C.22 D. 25
A.
B.
C.
D.
D
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【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