18. One kind of tools which are in common use for daily maintenance works on the
ship is the one-piece with a U-shaped opening that grips two opposite faces of a bolt
or nut. This tool is often double-ended with different-sized opening at each end. Each
end of the tool is often oriented at an angle of around 15 degrees to the longitudinal
axis of the handle. Which tool is above description?
(A) Adjustable spanner
(B) Ring spanner
(C) Open-end spanner
(D) Hammer
阿摩線上測驗
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