作货币期货的空头套期保值来控制汇率风险的主体是（）
A. 进口商
B. 出口商
C. 借款人
D. 进口商和出口商
编写汇编语言程序比机器语言方便一些，但仍然不够直观简便。
A. 正确
B. 错误
爆炸性气体环境电气线路的安装方式可分为电缆布线方式和明敷不限方式。
A. 正确
B. 错误
Which of the following describe the process identifier that is used to run OSPF on a router (Choose two.)（）。
A. It is locally significant
B. It is globally significant
C. It is needed to identify a unique instance of an OSPF database
D. It is an optional parameter required only if multiple OSPF processes are running on the router
E. All routers in the same OSPF area must have the same process ID if they are to exchange routing informatio
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