單項選擇題

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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單項選擇題
Chemical burns are caused by the skin coming in contact with（）.
A.acids or alkalies
B.diesel oil
C.acids, but not alkalies
D.alkalies, but not acids
單項選擇題
Compared to internal structural plating. The exterior hull plating on a vessel is usually（）.
A.stronger
B.thinner
C.more corrosion resistant
D.a lower grade steel