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【简答题】
光度法测定水样中氨氮时，请分析如何才能使相关系数r满足要求。
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反馈参考答案：
举一反三
【多选题】Why does the buyer choose the recurring payment?
A.
Because he doesn't have enough money.
B.
Because he can't afford the item.
C.
Because he would rather pay it in due date.
D.
Because the price is not expensive.
【单选题】What is NOT mentioned when Maggie is talking about her experience in Ocean Park?
A.
Sharks.
B.
Dolphins.
C.
Tropical fishes.
D.
Crocodiles.
【单选题】What is not mentioned when Maggie is talking about her experience in Ocean Park?
A.
Shark.
B.
Dolphins.
C.
Tropical fishes.
D.
Crocodiles
【单选题】Why does the exporter usually insist on the buyer establishing a credit in his favor before shipment is unloaded?
A.
To collect the proceeds.
B.
To draw drafts.
C.
To revoke the contract.
D.
To reduce the possible risk.
【单选题】Why does the man bring his wife back?
A.
He has suggested some new arguments to her.
B.
He is very anxious to sell the house.
C.
He is afraid she might have offended a potential buyer.
D.
He wants her to continue to negotiate on his behalf.
【单选题】Maggie had got up and ___ breakfast when Jim came in.
A.
took
B.
was taking
C.
is taking
D.
has taken
【单选题】When Maggie is in a foreign country, ______.
A.
she can rely on the fact that most people speak English
B.
she expects everybody to be able to communicate in English
C.
she can’t guarantee that most people will speak English
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