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求助,,做題被判錯(cuò),,到底誰(shuí)正確,? |
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點(diǎn)評(píng)
第三空本來(lái)就是正的,,你仔細(xì)想想,。外齒輪和外齒輪嚙合轉(zhuǎn)動(dòng)方向相反,外齒輪和內(nèi)齒圈嚙合,,轉(zhuǎn)動(dòng)方向相同
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點(diǎn)評(píng)
這圖和你的在Z2那還是有差別的
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