平面一般力系保持平衡的条件是
A.主矢量为零,主矩不为零
B.主矩为零,主矢量不为零
C.主矢量与主矩同时为零
D.主矢量与主矩同时不为零
正确答案是C
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Fat can indeed act as a shock absorber in violent collision. A 2003 study of car-crash victims found that those with more fat were lcess likcly to suffer abdominal injuries. But the fat-as-airbag principle only goes so far. When a driver is flung