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【简答题】
称取铁矿石0.2000 g, 经处理后,用0.00833 mol/L 重铬酸钾标准溶液滴定,耗去25.20 mL,则铁矿石中 的质量分数为__________ [2分]%。
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皮皮学刷刷变学霸
举一反三
【单选题】Mother keeps telling me not to waste money because money is difficult ________ nowadays.
A.
earned
B.
earning
C.
to earn
D.
to be earned
【简答题】A．Because they may not be fashionable. B．Because they may not be worth the money. C．Because they may be too tight. D．Because they may not fit.
【简答题】Email sending and receiving
【简答题】What is the purpose of the Gmail team in sending this email? They hope the user will ___________________________ the account.
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