表征SF6气体理化特性的下列各项中,正确的是()。
A.无色、无味
B.无臭、无毒
C.可燃
D.惰性气体,化学性质稳定
参考答案:A, B, D
Most IP layer-based proxy mechanisms, such as network address translation (NAT), only support uni-directional proxy, from the internal network to external network (the Internet). The proxy establishes the communication channel by (86) IP addresses. The IP addresses must be (87) . These proxy mechanisms prevent applications that must establish return data channels from establishing their data channels, such as, multimedia applications. IP layer-based proxy mechanisms need additional software (88) for each application that uses (89) channels. SOCKS identifies communication targets through domain names, overcoming the restriction of using private IP addresses. SOCKS can use domain names to establish communication between separate LANs, with (90) IP addresses.
(86)是()
A. manufacturing
B. manipulating
C. conduct
D. implement
焊接结极质量检验项目就是检查整体焊接结极的质量。