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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1.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
2.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
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The company should establish and maintain procedures to control all documents and date which are relevant to（）.
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A tide is called diurnal when（）.
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