用碘化钾碱性高锰酸钾法测定高氯废水中的化学需氧量时,若水样中含有几种还原性物质,则取它们的平均K值作为水样的K值。
参考答案:错
解析:取加权平均值作为水样的K值。
(Alice advises Bill to read English every day and agrees to help him ...)
A:Why don ’t you look happy ?
B:Because I have a lot of trouble with my English, I can hardly pass the exam every time. 6
A:Don ’t worry. 7
B:No, I only read English before the exam.
A:Ah, that’s it. If you want to study it well,you must practise it every day. 8
B:I’ll take your advice and try to practise reading English every day. 9
A:All right. I’d like to. But in fact I still have some trouble with English, too. 10
A.Will you help me with it?
B.Let’s help each other.
C.I’ll try my best to learn it well.
D.How do you like English?E.I really don ’t know what to do.
F.What are you going to do next?
G.Do you read English?
销售与收款循环内部控制的关键控制点有哪些?