有五种化合物,它们两两之间发生的某些转化关系如图箭头所示.请回答: (1)Na2

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问题:

有五种化合物,它们两两之间发生的某些转化关系如图箭头所示.请回答:

(1)Na2SO4→NaCl的转化反应属于反应______(填基本反应类型);这一类型反应能发生必须具备的条件之一是______(填一种).

(2)NaOH→Na2SO4______;(反应的化学方程式)

(3)在图中的物质间转化关系中有的可以逆向转化.

他们分别是:______→______;______→______(填化学式).

考点:物质的相互转化和制备
题型:问答题

During our two months on the road, Bennett and I had a really (1) experience with a good, honest (2) and some helpful mechanics.

We were driving east on Highway 10 when our "chick engine" light came on. We limped of a(n) (3) into Las Cruces. We had a real car (4) Bennett nursed the ear into a local garage. By this time the car was missing so (5) it was shaking all over. This was the (6) time to arrive at a garage—late Friday afternoon. Service adviser Scott was busy (7) paper work and customers as we (8) our problems. (9) he was already "ten cars behind", he told us to pull the car into the garage.

Lincoln, who we later (10) was one of the two motor technicians, took (11) of our car repairing. He and Scott and some other mechanics stayed several hours after closing, (12) the car.

Early the next morning (the shop was officially closed on Saturdays), Lincoln finally located the (13) and fixed it easily within only (14)

Later Scott (15) out to us that it was our attitude that helped. "You didn’t come into the place demanding this or that. You showed an (16) of our problems on a busy Friday afternoon. Customer’s attitude means a lot. " He was right in some way, customers should show (17) and understanding to people who (18) them. (19) people were extremely busy, they found way to at least try and help when they are met with politeness.

The pleasant experience I had shows that (20) for other people can always help.

17().

A.cruelness 

B.fairness 

C.calmness 

D.politeness

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设计表达的特征一般表现为______等方面。

A.图、文

B.影音

C.感觉

D.感受

E.表演

题型:问答题

The skin, an ____ part of your body and its largest organ, ____ as a barrier against diseases.[ ]

A. vital, acting  

B. vital, acts    

C. essential, acting  

D. essential, acts

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关于小流域综合治理开发模式的叙述,正确的是()

A.深耕改土是工程措施

B.轮作套种是农业技术措施

C.抽水、引水灌溉是农业技术措施

D.选育良种是生物措施

题型:问答题

大陆型地壳结构包括()和()两个部分。

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