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下列说法中不正确的是( ) A.√4²的算术平方根是4 B.√4的算术平方根是√2 C.√3²的算术平方根是√3 D.√81的算术平方根是9
1年前
某运动员吸一口气,吸进400cm^3的空气,据此估算他所吸进的空气分子的总数为1×1022个.已知1mol气体处于标准状态时的体积是22.4L.(结果保留一位有效数字)
1年前
Professor White has written some short stories, but he is _____ for his plays.
1年前
They often help ___________with their housework. [ ]
1年前
It’s reported that the government hasn’t found the missing plane’s black box yet.
1年前