某校，中午在食堂就餐的大部分同学发生呕吐，腹痛，腹泻。卫生部门对该食堂就餐环境及餐具

不小于-4的负整数有[ ]

A．2个    

B．4个    

C．3个

We don't keep winning games ________ we keep playing well.[ ]

A. because  

B. unless

C. when  

D. while

Which of the following statements about intangible assets is least likely correct（）

A. Generally, internally produced intangible assets are not reported on the balance sheet.   B. In most countries, research and development costs are capitalized.  

C. Intangible assets are reflected at their purchase prices when acquired from an outside entity.

各级党组（党委）要把党风廉政建设纳入全局工作一同（）

A.部署

B.落实

C.检查

D.考核

进程P1、P2、P3、P4和P5的前趋图如下：

若用PV操作控制进程P1～P5并发执行的过程，则需要设置6个信号量S1、S2、S3、S4、S5和S6，且信号量S1～S6的初值都等于零。下图中a和b处应分别填写 (23) ；c和d处应分别填写 (24) ，e和f处应分别填写 (25) 。

（25）是（）

A．P(S3)P(S4)和V(S5)V(S6)

B．V(S5)V(S6)和P(S5)P(S6)

C．P(S2)P(S5)和P(S4)P(S6)

D．P(S4)V(S5)和P(S5)V(S6)