柴油机的临界转速在转速表上用（）色标明其区域，操车时，应使转速（）通过临界转速区域。

       春秋时期，周天子大权旁落，________和________遭到破坏，各诸侯国为了控制更多的土地和人民，互相进行战争。

为了选择下面两种突变型，应对只含有葡萄糖、硫酸铵以及无机离子的基本培养基做何调整？ （1）leu，亮氨酸营养缺陷型。 （2）gal，不能以半乳糖作为惟一碳源的突变型。

Today’s lecture is about the mass (1) of the world’s population. There are two major (2) why people are moving to cities. The first reason is (3) . People are moving to the cities because that’s where they can find (4) and earn money. The second reason for the move to cities has to do with (5) of life issues: comfort and (6) . Cities often offer better (7) . And then for many, city life is just more (8) . An interesting consequence of urbanization is that the average (9) of people in the countryside is increasing, while that of the cities is (10) .
Three key (11) can be identified in our cities. First of all, they’re getting bigger. Most cities are bigger now than ever before. Cities are also changing shape. They’re getting (12) , because land is getting more and more expensive. (13) have become a symbol of modern cities.
Cities are also changing shape in other ways. The (14) Model and the (15) Nuclei Model are probably more typical of the cities we know today. They show the urban (16) that’s occurring in contemporary cities.
The third change is that our cities are breaking up into (17) communities, often by (18) group or (19) level. This often means that people stay within their community and do not come into contact with others from different (20) .

小儿初次感染结核菌至产生变态反应的时间是（）。

A．2-3天

B．4-6天

C．7-12天

D．2-3周

E．4-8周

试用期倦怠，是指新人职员工在试用期内因不适应新环境而表现的一种倦怠情绪。员工初到企业的阶段已经成为离职高发率时段，而试用期倦怠最易表现在人职后的第三、第四周。
根据上述定义，以下属于试用期倦怠的是( )。

A．老谢新到一家私企任高管，不太熟悉公司内部环境，导致需要经常加班处理一些事务
B．任女士跳槽到另一城市的一家大公司，上班第一周因为迷路、堵车等原因迟到好几次
C．小林去某企业做销售助理，转正之前，辞职去了另一家待遇更好的公司
D．宋在公司干了一个月，由于对工作内容不熟悉，什么都要从头学起，压力很大，犹豫要不要辞职