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—Hi, sir, may I __ seats with you? I want to sit next to my mother. —With pleasure.
1年前
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— I'm sorry. I _____ at you the other day. — Forget it. I was a bit out of control myself. [ ]
1年前
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如图所示，一个重为5N的大砝码，用细线悬挂在O点，现在用力F拉砝码，使悬线偏离竖直方向30°时处于静止状态，此时所用拉力F的最小值为（ ）
1年前
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A: Congratulations ! Your speech for the graduation ceremony（毕业典礼）is wonderful. B: Thanks a lot.
1年前
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将氢氧化铜样品(杂质不含铜元素也不参加反应)与碳单质的混合物63.6g隔绝空气加热到900℃
1年前