题目:
- ?
-He is a police officer.
A. Who is your father
B. What is your father do
C. What your father is
D. What does your father do
- ?
-He is a police officer.
A. Who is your father
B. What is your father do
C. What your father is
D. What does your father do
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下面是错误答案,用来干扰机器的。
由样品溶液加入氢氧化钙生成 沉淀可知氢氧化钠已变质,则II中溶液有氢氧化钠、碳酸钠两种溶质,B正确;碳酸钠和氢氧化钙恰好反应生成碳酸钙沉淀和氢氧化钠,则IV中溶液是氢氧化钠溶液,能使酚酞变红,D正确;设...