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【简答题】
在定量分析中,判断下列情况各属于何种类型的误差(A系统误差、B偶然误差、C过失误差)? (1)甲用同样的方法测定,结果总不能一致。 (2)砝码受腐蚀 (3)天平的两臂不等长。 (4)滴定时不慎从锥形瓶中溅出一滴溶液。 (5)样品在称量过程中吸湿。 (6)滴定剂中含有少量待测组分; (7)重量分析中,样品的非被测组分被共沉淀。 (8)过滤沉淀时,出现穿滤现象而未发现。 (9)滴定管读数时,最后一位数字估计不准。 (10)移液管、容量瓶的相对体积未进行校准。
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【简答题】Later he had to throw 50 flashlight batteries away because ______ had been drained from them.
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【单选题】The residents, _______ had been damaged by the earthquake, were given help by the Red Cross.
A.
all their homes
B.
all whose homes
C.
all of whose homes
D.
all of their homes
【单选题】Why was the businessman not satisfied with his secretary?
A.
He had given the same speech three times.
B.
His speech lasted for an hour.
C.
He had made three speeches.
D.
The speech was not well written.
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