單項選擇題

The smallest size of flaw that can be detected on a radiograph examination of a weld will be indicated by the（）.

A.film speed
B.penetrometer
C.exposure reading
D.time of exposure

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單項選擇題

The lines led forward from the bow and aft from the stern when a vessel is moored to the dock are（）.

A.bow and stern lines
B.breast lines
C.halyards
D.warps

單項選擇題

The end of the joint with the exterior threads is called the（）.

A.pin
B.stem
C.box
D.stand