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I didn't see your sister at the meeting. If she _____, she would have met my brother. [ ]
1年前
用久了的电灯泡会变黑,是因为钨丝受热产生______现象,然后钨蒸气又在灯泡壁上______的缘故.
1年前
Years ago I worked at a factory in a small county.
1年前
《前赤壁赋》通假字,一词多义,古今异义,词性活用,特殊句型,重点句子翻译
1年前
已知二次函数f(x)=ax^2+bx(a,b为常数,且a不等于0),满足条件:f(2)=0,且方程f(x)=x有两个相等的实根(1)求f(x)的解析式
1年前