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【单选题】
若试剂中含有微量被测组分,对测定结果将产生:A.
过失误差
B.
系统误差
C.
仪器误差
D.
偶然误差
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反馈参考答案：
举一反三
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【简答题】句型改写 根据所给单词、词组或题目指示改写下列句子。 1. It is not so bad that we can do nothing about the situation. (never too...to...) 2. Sandy promised to marry John on condition that she won the approval of her father. (as...
【单选题】我们经常说“六畜兴旺、五谷丰登”，“六畜”是指猪、牛、马、羊、狗、鸡、六种，其中人工驯化最早的是（ ）。
A.
留在了燃烧产物里了
B.
提高了燃烧的总热能
C.
被我们人体消耗掉了
D.
煤的总能量根本就没增加
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