单项选择题
The “grip” of a joint represents the（）.
A.thickness of the connected members B.diameter of the head C.entire length of the rivet D.diameter of the shank
单项选择题 Starting motors，generators，and other spark producing devices should be mounted as high above the bilges as possible to（）.
单项选择题 Small hull leaks can be temporarily repaired by（）.
单项选择题 Rivets are usually made of（）.
