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單項(xiàng)選擇題

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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單項(xiàng)選擇題

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

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

單項(xiàng)選擇題

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

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