试题与答案

吐温类表面活性剂溶血作用的顺序是( )A.吐温20>吐温40>吐温60>吐温80B

题型:单项选择题

题目:

吐温类表面活性剂溶血作用的顺序是( )

A.吐温20>吐温40>吐温60>吐温80
B.吐温80>吐温60>吐温40>吐温20
C.吐温80>吐温40>吐温60>吐温20
D.吐温20>吐温60>吐温40>吐温80
E.吐温40>吐温20>吐温60>吐温80

答案:

参考答案:D

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题型:实验题

使用久了的热水壶内常有水垢,为了除去水垢,某兴趣小组的同学从超市购来“除垢净” ,除水垢时,有大量气泡产生。该组同学欲对:

【提出猜想】“除水垢”的成分中含有酸。

【查阅资料】水垢的主要成分是Mg(OH)2和CaCO3

【设计实验】

⑴甲同学取“除垢净”少许,滴几滴无色酚酞试液,溶液为无色,则得出结论:“除垢净”的成分中含有酸。

乙同学认为:据此还不能得出这样的结论,理由是                              

⑵乙同学从家中找来两种物质继续做了如下两个实验:

       

⑶同学们想试制一瓶“除垢净”,甲同学认为选用稀硫酸作“除垢净”合适,乙同学认为不妥,其理由是                                                                   。

(4)热水壶内的水垢还可以用厨房中的                   来除去。

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题型:单项选择题

When anyone opens a current account at a bank, he is lending the bank money. He may (1) the repayment of the money at any time, either (2) cash or by drawing a check in favor of another person. (3) , the banker customer relationship is that of debtor and creditor who is (4) depending on whether the customer’s account is (5) credit or is overdrawn. But, in (6) to that basically simple concept," the bank and its customer (7) a large number of obligations to one another. Many of these obligations can give (8) to problems and complications but a bank customer, unlike, say, a buyer of goods, cannot complain that the law is (9) against him.

The bank must (10) its customer’s instructions, and not those of anyone else. (11) , for example, a customer opens an account, he instructs the bank to debit his account only in (12) of checks drawn by himself. He gives the bank (13) of his signature, and there is a very firm rule that the bank has no right or (14) to pay out a customer’s money (15) a check on which its customer’s signature has been (16) . It makes no difference that the forgery may have been a very (17) one, the bank must recognize its customer’s signature. For this reason there is no (18) to the customer in the practice, (19) by banks, of printing the customer’s name on his checks. If this (20) forgery, it is the bank that will lose, not the customer.

5()

A.on

B.with

C.in

D.for

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