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【单选题】
在对非水酸碱滴定的叙述中不正确的是()。A.
溶剂的使用有利于提高被检测物的酸碱性
B.
溶剂应能溶解试样和滴定产物
C.
溶剂应有足够纯度,其杂质不能干扰测定
D.
溶剂应有较小的挥发性,使用有足够的安全性
E.
在使用甲酸、乙酸作溶剂时,一般加入一些乙酸酐,其目的是除去溶剂中的微量水
F.
当选用乙醇、异丙醇作溶剂时,一般要用除水剂去除溶剂中的微量水
G.
由于碱性溶剂吡啶中基本不含水,因此使用吡啶作溶剂时可不用除溶剂中的微量水
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【单选题】根据《铁路旅客运输办理细则》，线路中断时，旅客要求在发站或一个中途站(返回途中自行下车无效)等候继续旅行，凭原票在通车()可恢复旅行。
A.
5日内
B.
10日内
C.
15日内
D.
30日内
【单选题】An average human being has how many litres of blood?
A.
1 litre
B.
2litres
C.
5 litres
D.
10 litres
【单选题】To produce 19 litres of Product X, a standard input mix of 8 litres of chemical A and 12 litres of chemical B is required. Chemical A has a standard cost of $20 per litre and chemical B has a standard...
A.
Both variances were adverse
B.
Both variances were favourable
C.
The total mix variance was adverse and the total yield variance was favourable
D.
The total mix variance was favourable and the total yield variance was adverse
【单选题】340 litres of chemical X were produced in a period. There is a normal loss of 10% and an abnormal loss of 5% of the material input into the process.How many litres of material were input into the proc...
A.
377 litres
B.
400 litres
C.
380 litres
D.
358 litres
【单选题】Did you know that ___________ a single ton of steel, _______ takes about 91,000 litres of water?
A.
producing ; it
B.
to produce ; it
C.
to produce ; which
D.
producing ; which
【单选题】《铁路旅客运输办理细则》线路中断后，旅客要求在发站或一个中途站（返回途中自行下车无效）等候继续旅行，凭原票在通车（）日内可恢复旅行。旅客要求恢复旅行时，车站应办理签证手续。
A.
10
B.
11
C.
12
D.
13
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