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We all understand that learning a foreign language ______ time and efforts.
11个月前
如图所示,是探究质量为m1的水沸腾时温度随时间变化的图象,现用质量为m2(m2>m1)的水重复该实验(其他条件不变)。
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Helen is in bed. She's got ____. [ ]
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We should play an ________ (积极的) role in politics, both at the national and local level.
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解三元一次方程组,x-y-z=1,2x+y-3z=4,3x-2y-z=-1
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