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问题 单项选择题

微量元素测定时，清洗玻璃器皿的方法正确的是（）

A.流水冲洗后浸泡于重铬酸清洁液数小时，用自来水冲洗干净，再用蒸馏水冲洗2～3次

B.用2%次氯酸溶液浸泡数小时，再用自来水冲洗干净即可

C.单独清洗，用稀硝酸浸泡后，再用去离子水冲洗2～3次

D.用肥皂水清洗后，再用自来水冲洗干净即可

E.应流水冲洗后浸泡于2%盐酸数小时，再用自来水冲洗干净即可

答案

参考答案：C

单项选择题

产品提供是市场营销的重中之重，必须针对消费者需求进行产品提供。下列对营销学上的产品描述最准确的是( )。

A．有形的劳动产品

B．无形的服务类产品

C．随同产品出售的附加服务

D．能通过市场进行交换，提供给人们消费使用，能够满足人们某种欲望或需要的任何东西
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单项选择题

Analysts have their go at humor, and I have read some of this interpretative literature, (1) without being greatly instructed. Humor can be (2) , (3) a frog can, but the thing dies in the process and the innards are (4) to any but the pure scientific mind.

One of the things (5) said about humorists is that they are really very sad ’people clowns with a breaking heart. There is some truth in it, but it is badly (6) . It would be more (7) , I think, to say that there is a deep vein of melancholy running through everyone’s life and that the humorist, perhaps more (8) of it than some others, compensates for it actively and (9) Humorists fatten on troubles. They have always made trouble (10) They struggle along with a good will and endure pain (11) , knowing how well it will (12) them in the sweet by and by. You find them wrestling with foreign languages, fighting folding ironing hoards and’ swollen drainpipes, suffering the terrible (13) of tight boots. They pour out their sorrows profitably, in a (14) of what is not quite fiction nor quite fact either. Beneath the sparking surface of these dilemmas flows the p (15) of human woe.

Practically everyone is a manic depressive of sorts, with his up moments and his down moments, and you certainly don’t have to be a humorist to (16) the sadness of situation and mood. But there is often a rather fine line between laughing and crying, and if a humorous piece of writing brings a person to the point (17) his emotional responses are untrustworthy and seem likely to break over into the opposite realm, it is (18) humor, like poetry, has an extra content, it plays (19) to the big hot fire which is Truth, and sometimes the reader feels the (20) .

19（）

A.open

B.related

C.close

D.devoted
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