Grade 9 Test on Mechanics 20241217 (id: a80fa91d5)

[单选题]
When you sit on a chair, cu;h7( 9lt9* kxoua v-jyt3ruthe resultant force 4j4;x v ekh(*yc/zzbws uw4h3on you is

A. zero.
B. up.
C. down.
D. depending on your weight.


参考答案:  A


本题详细解析: 暂无

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