Geometry of the basic unit of the extended hydrogen bonding ..

第1题

Which type of chemical bonding enable aramid fiber with high strength?

A、covalent bonding

B、metalic bonding.

C、hydrogen bonding

D、van de Waals force

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第2题

The bonding type of Aluminum is

A、Ionic bondingIonic bonding

B、Metallic bonding

C、Covalent bonding

D、Hydrogen bonding

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第3题

The degradation properties could be changed by copolymerization of biodegradable polymers.

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第4题

Because of hydrogen bonding, hydrogen fluoride (HF) has a higher boiling point than hydrogen chloride (HCl)

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第5题

The driving force for steady-state diffusion is the __________.

A、(a) concentration gradient

B、(b) electric field

C、(c) temperature

D、(d) atomic oscillations

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第6题

There must be a collision if we insert a new element into a hash table with the loading density being 1.

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第7题

Which of the followings are all Heavenly Stems?

A、A.chen yi bing ding

B、B.wu ji geng xin

C、C.ding xin ren kui

D、D. shen you xu hai

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第8题

More than forty thousand readers told us what they looked for in close friendships, what they expected 31 friends, what they were willing to give in32 , and how satisfied they were 33 the quality of their friendships. The 34 give little comfort to social critics.

Friendship 35 to be a unique form. of 36 bonding. Unlike marriage or the ties that 37 parents and children, it is not defined or regulated by 38 . Unlike other social roles that we expected to 39 as citizens, employees, members of professional societies and 40 organizations—it has its own principle, which is to promote 41 of warmth, trust, love and affection 42 two people.

The survey on friendship appeared in the March 43 of Psychology Today. The findings 44 that issues of trust and betrayal are 45 to friendship. They also suggest that our readers do not 46 for friends only among those who are 47 like them but find many 48 differ in race, religion, and ethnic background. Arguably the most important 49 that emerges from the data, 50 is not something that we found---but what we did not.

(1)[]

A.on

B.of

C.to

D.for

(2)[]

A.addition

B.reply

C.turn

D.return

(3)[]

A.about

B.of

C.with

D.by

(4)[]

A.results

B.effects

C.expectations

D.consequences

(5)[]

A.feels

B.leads

C.sounds

D.appears

(6)[]

A.human

B.humane

C.individual

D.private

(7)[]

A.bind

B.attach

C.control

D.attract?

(8)[]

A.discipline

B.law

C.rule

D.regulation

(9)[]

A.keep

B.do

C.show

D.play

(10)[]

A.all

B.any

C.other

D.those

(11)[]

A.friendship

B.interests

C.feelings

D.impressions

(12)[]

A.between

B.on

C.in

D.for?

(13)[]

A.print

B.issue

C.publication

D.copy

(14)[]

A.secure

B.sure

C.confirm

D.solve

(15)[]

A.neutral

B.main

C.nuclear

D.central

(16)[]

A.ask

B.call

C.appeal

D.look?

(17)[]

A.most

B.more

C.least

D.less

(18)[]

A.people

B.who

C.what

D.friends

(19)[]

A.conclusion

B.sum

C.decision

D.claim

(20)[]

A.moreover

B.however

C.still

D.Yet

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Explain the structure of C3O2 in terms of the bonding in the molecule.