用福尔哈德法测定Ag+，滴定时必须剧烈摇动。用返滴定法测定Cl-时，也应该剧烈摇动。( )
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The truck driver is__________________(对这起交通事故负全责).
沉淀BaSO4应在热溶液中进行，然后趁热过滤。( )
A. 对
B. 错
莫尔法既可采用直接滴定，也可采用返滴定。( )
A. 对
B. 错
Questions 11 to 18 are based on the conversation you have just heard.
A. She’s going away for a while.
B. She did well on the test.
C. She worked hard and earned a lot of money.
D. She’s didn’t have to work hard for the exam.
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