《苦恼》的作者契诃夫是哪国作家（）。 A.法国 B.美国 C.英国 D.俄国

下列哪个选项可以正确计算42度(角度)的余弦值 ( )

A．double d=Matcos(42)；

B．double d=Matcosine(42)；

C．doubb d=Matcos(MattoRadians(42))；

D．double d=Matcos(MattoDegrees(42))；

Which of the following is NOT implied in the passage a. The rising rate of divorces is attributed to the increasing influence of western cultures. b. Divorce was regarded as a disgrace in Japan more than a decade ago. c. Harmony has long been treasured in Japanese society d. Group awareness is becoming weaker nowadays.

McAfee Associates VirusScan是( )软件。

A．文档管理软件

B．传真软件

C．群件软件

D．病毒防治软件

正常成年人安静时的肺通气/血流比值为

A．0.048

B．0.084

C．0.24

D．0.48

E．0.84