按压实原理,压实机械主要分为()、()和()和()

题型:填空题

问题:

按压实原理,压实机械主要分为()、()和()和()

考点:公路工程监理工程师公路工程机械化施工公路工程机械化施工题库
题型:填空题

有性生殖和无性生殖的根本区别是:有无两性______的结合.有性生殖的后代生活力______;无性生殖有以下几种:①营养生殖;②分裂生殖;③出芽生殖和④______.无性生殖子代个体数量多,繁殖速度快,而且子代能稳定地保持母体的______;但其后代的生活力有______的趋势.

题型:填空题

江畔何人初见月江月何年初照人

A.2

B.3

C.4

D.5

题型:填空题

Passage One


It is quite reasonable to blame traffic jams, the cost of" gas and the great speed of modern life, but manners on the toad are becoming horrible. Eye,body knows that the nicest men would become fierce tigers behind the wheel. It is all right to have a tiger in a cage, but to have one in the driver’s seat is another matter.
Road politeness is not only good manners, but good sense too. It takes the most cool-headed drivers great patience to give up the desire to beat back when forced to face rude driving. On the other hand, a little politeness goes a long way towards reducing the possibility of quarrelling and fighting. A friendly nod or a wave of thanks in answer to an act of politeness helps to create an atmosphere of good will and calmness so necessary in modern traffic conditions. But such behaviors of politeness are by no means enough. Many drivers nowadays don’t even seem able to recognize politeness when they see it.
However, misplaced politeness can also be dangerous. Typical examples are the driver who waves a child crossing the street at a wrong place into the path of oncoming cars that may be not able to stop in time. The same goes for encouraging old ladies to cross the road wherever and whenever they want to.
An experienced driver, whose manners are faultless, told me it would help if drivers learnt to correctly join in traffic stream without causing total blockages that give rise to unpleasant feelings. Unfortunately, modern drivers can’t even learn to drive,let alone master the roadmanship. Years ago, experts warned us that the fast increase of the car ownership would demand more give-and-take from all road users. It is high time for all of us to take this message to heart.

It is not always right for drivers to______.

A.master roadmanship

B.recognize politeness when they see it

C.encourage old ladies to cross the road whenever and wherever they want

D.give a friendly nod in answer to an act of politeness

题型:填空题

患者,男性,63岁,颊癌术后7年,术后曾行颈部及下颌下区放疗,剂量不详。3个月前行出现下颌牙龈溃疡,经久未愈且局部骨外露伴下颌区域针刺剧痛。

口腔颌面部软组织对放射线平均耐受量约为6~8周给予

A.20~40Gy

B.40~60Gy

C.60~80Gy

D.80~100Gy

E.100Gy以上

题型:填空题

该表为我国某城市人口资料。读下表完成下题。

该城市自1982年至2000年()

A.人口自然增长率很高,人口增长迅速

B.人口出生率增高,人口老龄化问题得到缓解

C.人口出生率大幅度降低,人口死亡率大幅度增高

D.人口增长率很高,有大量青壮年人口迁入

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