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简述网页色彩三原色及其调配范围？

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电控燃油喷射系统的故障诊断除用解码器外，还可用电压表诊断其故障。

A. 正确
B. 错误

按照《中国成人超重和肥胖症预防控制指南》，肥胖是指BMI大于等于（）

A. 18.5
B. 20
C. 21
D. 23
E. 25

The system administrator has been getting complaints about slow performance from the server. After running vmstat the administrator notices average readings that show the free list （fre） approaching zero， as well as page-in （pi） and page-out （po） values to be high. Furthermore， the applications running are essential to daily business operations. Which of the following recommendations would provide the best overall improvement？（）

A. Increase physical disk
B. Increase number of CPU’s
C. Increase physical memory
D. Increase number of server

压力表投入程序应先（），然后将三通旋塞旋至正常工作位置投入运行。

A. 堵塞压力表弯管
B. 冲洗压力表
C. 冲洗压力表弯管
D. 打开放空阀