单项选择题
A.The moment of inertia would remain unchanged
B.The moment of inertia would be 1/4 its original value
C.The moment of inertia would be 1/2 the original value
D.None of the above
单项选择题 A tackle is “two blocked” when the blocks are（）.
单项选择题 A swift current occurring in a narrow passage connecting two large bodies of water，which is produced by the continuously changing difference in height of tide at the two ends of the passage，is called a（）.
单项选择题 A survival craft being used to pick up a person who has fallen overboard from a ship should approach the person（）.