与体层面厚度有关的因素是（）。 A.荡角 B.层深 C.层间距 D.照射角 E.支点

阅读短文，判断对(T)错(F)。

      Jim lives in England.  He is a pupil.  He has got a new blue bike.  He goes to school by bike.  Jim's

father is a doctor.  He has got a car.  He goes to work by car.  Jim's mother has got a bike, but she likes

walking to work. In the summer holiday(假期) they went to Shanghai by plane. Jim has got a new book

about Chinese New Year.  He likes it very much.

( ) 1. Jim has got a new black bike.

( ) 2. Jim's father goes to work by car.

( ) 3. Jim's mother has got a bike and she goes to work by bike.

( ) 4. They went to Shanghai by plane.

( ) 5. Jim doesn't like the new book.

人行道在桥面断缝处必须做( )。

A．防水

B．伸缩缝

C．栏杆

D．防护设备

直流锅炉控制工作安全门的整定值为（ ）倍的工作压力。

A．1.08/1.10

B．1.05/1.08

C．1.25/1.5

D．1.02/1.05

黄斑的疵病形态是织物的全部带有暗棕色。

甲企业为了使企业所排放的污染物符合国家标准，不惜成本买人先进设备控制排放量，而这也无形中增加了产品的成本，利润甚微。最近国家出台了生产该种产品的企业应该符合的污染物排放标准，淘汰了很多小型企业。这对甲企业来讲，属于( )。

A．优势
B．劣势
C．机会
D．威胁