单项选择题

Cracks may be prevented from developing at the corners of welded plating inserts by（）.

A.squaring the corners
B.rounding the corners
C.plug welding the corners
D.slot welding the corners

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单项选择题

Connecting elements of a mooring system should be fabricated from（）.

A.cast iron
B.forged steel
C.stainless steel
D.cast steel

单项选择题

Chain slings are suitable for heavy slender articles，such as（）.

A.timber or steel rails
B.locomotives or boilers
C.railway passenger coaches
D.motor vehicles

单项选择题

Chafing gear（）.

A.reduces and prevents corrosion of standing rigging
B.prevents corrosion of running rigging
C.reduces and prevents wear caused by the rubbing of one object against another
D.protects the body against extreme cold