以下不属于中国公民出入境的有效证件是（）。A.护照 B.出入境通行证 C.身份证 D

Put the pot _____________ the sun everyday. [ ]

A. behind

B. under

C. on

在研究某社区食盐摄入量与高血压关系的队列研究中，食盐摄入量高的队列高血压的发病率为35.40%，食盐摄入量低的队列高血压的发病率为8.85%，该社区的人群高血压的发病率为18.80%。根据此资料计算。 相对危险度为（）

A.2.00

B.3.00

C.4.00

D.5.00

E.无法计算

药物致畸的高敏感期是受精后

A．1～2周
B．2～3周
C．3～4周
D．3～5周
E．4～5周

The demand for 3M’s optical film is closely related with the World Cup soccer games because the optical film ().

A.is used in LCD and LCD is used in quality televisions and computers

B.is used in LCD and LCD is used to receive audio and video signals

C.is a better receiver of audio and video signals than televisions and computers

D.can be mounted on televisions and computers to improve the quality of images

拉伸圆形试样的平行部分长度一般不小于Lo+bo/2，仲裁试验时应为（）。

A.Lo+bo

B.Lo+2bo

C.Lo+bo/2