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所有精神疾病患者都失去自知力，造成劳动力的完全丧失。()

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What will probably happen after this conversation？

A. Tim fails to give guided tours because he needs to get all the textbook orders done.
B. Tim manages to be a volunteer for the new students on both mornings of Thursday and Friday.
C. Ken calls Tim to set their schedule up for the guided tours.
D. Ruth calls Tim to get their schedule done for the guided tours.

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In "Please show me the picture you drew just now", "me" is the ______ of the sentence.

A. indirect object
B. formal object
C. direct object
D. real object

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用自动定氮分析法测定蛋白质是将蛋白质中的氮元素转化成氮，()，然后测定氮量。

A. 与磷酸化合生成磷酸铵
B. 与硝酸化合生成硝酸铵
C. 与硫酸化合生成硫酸铵
D. 与盐酸化合生成盐酸铵

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测定罐头食品中的亚硝酸盐含量时，将试样加入饱和硼砂溶液后，用()左右的水约300mL将试样洗入500mL的容量瓶中，于沸水浴中加热15min，取出冷却备用。

A. 100℃
B. 85℃
C. 70℃
D. 50℃

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