JZ-7型空气制动机分配阀的紧急限压阀,紧急制动时直接限制()压力不超过450kpA。
A. 制动缸
B. 作用风缸
C. 降压风缸
D. 紧急风缸
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对路由器A配置RIP协议,并在接口S0(IP地址为10.0.0.1/24)所在网段使能RIP路由协议,在系统视图下使用的第一条命令是()。
A. Rip
B. rip10.0.0.0
C. network10.0.0.1
D. network10.0.0.0
What is the wavelength, if the frequency is 6MHz?
A. 180m
B. 18m
C. 50m
D. 500m
A ship operating in sea area A1 must have the following provisions of maintenance:
A. Shore maintenance
B. Duplication of equipment
C. At Sea Maintenance
D. Any one of these
Which of the following systems is most likely to be subject to fading or static interference?
A. HF NBDP
B. INMARSAT
C. Digital Selective Calling on channel 70
D. VHF ARQ