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地线种类有直流地、屏蔽地、静电地、雷击地和（）

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所有会计核算程序都是在（）核算程序的基础上产生和发展起来的。

A. 原始凭证
B. 记账凭证
C. 记账凭证汇总表
D. 汇总记账凭证

According to the US.Department of Labor,by 2008,there were 2,618,000 nurses.By 2018,there will be over 3,200,000 nurses.However,only six percent of nurses are males.Besides,an experienced nurse may earn as much as$92,000 a year in addition to receiving bonuses.It shows that the nursing profession for males has a(n)（）job.

A. suitable
B. important
C. promising
D. amazing

Without someone to（）for advice,completing this task can be difficult for Tom.

A. turn up
B. turn to
C. turn over
D. turn on

防盗、防火、防静电、防雷击、防电磁泄漏等安全措施，属于计算机网络安全层次中的（）