题目内容

【多选】强酸沉淀法,常用的强酸有()

A. 磷酸
B. 三氯醋酸
C. 高氯酸
D. 硫酸
E. 硝酸

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【多选】生物样品测定前要进行预处理,因为()。

A. 生物样品中被测物浓度低
B. 成分复杂,干扰多
C. 药物在体内以多种形式存在
D. 蛋白质对测定有干扰
E. 测定工作量大

everyone got excited with the grand (celebration) of the 70th anniversary of the founding of the People's Republic of China.

A. 对
B. 错

Chinese people are famous for their kindness and (hospitality).

A. 对
B. 错

When all the lost things were (presented) to the owner by the police, he could hardly believe it was true.

A. 对
B. 错

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