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【单选题】
作用于手柄端的力F =600 N，
试计算力F在x轴上的投影及对x轴之矩为（ ）。
A.
367.4N；-42.4N·m
B.
367.4N；-103.9N·m
C.
212.1N；42.4N·m
D.
212.1N；103.9N·m
参考答案：
参考解析：
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B.
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