通常情况下，什么时候禁止对机器进行维修工作（）。 A.没有安全员在场 B.机器在开动

下列情况，不属于植物无性生殖的是（　　）

A．用秋海棠的叶繁殖新个体

B．播种水稻繁殖新个体

C．用月季的茎繁殖新个体

D．用马铃薯块茎繁殖新个体

2011年6月21号，我国发射了“中星10号”地球同步通信卫星，卫星的质量5.22t．下列说法中正确的是（　　）

A．卫星可以定点在北京正上方

B．卫星运行的向心加速度小于地球表面的重力加速度

C．卫星的线速度大于第一宇宙速度

D．卫星的角速度小于月球绕地球的角速度

As mentioned above, C imposes relatively few built - in ways of doing things on the program- mer. Some common tasks, such as manipulating (66) , (67) , and doing (68) (I/O), are performed by calling on library functions. Other tasks which you might want to do, such as creating or listing directories, or interacting with a mouse, or displaying windows or other (69) elements, or doing color graphics, are not defined by the C language at all. You can do these things from a C program, of course, but you will be calling on services which are peculiar to your programming environment (70) , processor, and operating system) and which are not defined by the C standard. Since this course is about portable C programming, it will also be steering clear of facilities not provided in all C environments.

A．lines

B．strings

C．threads

D．routes

简述绩效面谈的主要类型。

男，47岁，进食油煎鸡蛋后出现右上腹剧痛，并放射至右肩胛区，伴畏寒、发热，应考虑的诊断为

A．急性胆囊炎

B．急性胃肠炎

C．急性心肌梗死

D．急性胰腺炎

E．十二指肠球部溃疡