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【单选题】
在使用碘量法测定铜合金中铜的含量时,加入 NH4HF2 的主要目的是A.
作为指示剂
B.
调节溶液的 pH
C.
消除 Fe3+ 的干扰
D.
转化 CuI 沉淀
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反馈参考答案：
举一反三
【单选题】I didn’t go out with him a second time ( ) once was more than enough.
A.
;
B.
,
C.
--
D.
/
【判断题】I don't let him go out in this weather in case he should catch cold. 是in case引导的目的状语从句。
A.
正确
B.
错误
【单选题】—Mom, Tom asked me to play football with him. Shall I go out now? —______. Be careful and don’t play in the street.
A.
Yes,you will
B.
With pleasure
C.
Of course not
D.
Sure
【简答题】_______是指学习者在学一特定的学科 内容时,已经具备的有关知识一技能的基础,以及他们对这些学习内容的认识和态度,
【简答题】--Why didn't you stop him going out? - -Sorry, but I ____________ (write) an article and didn't notice him go out.
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