管道自然补偿
参考答案:
利用管道自身的几何形状及适当的支承结构,以满足管道的热胀、冷缩或位移要求。
患者,男,50岁。时有咳嗽,动则气喘,阳事无力。首选药物是()。
A.西洋参
B.白果
C.蛤蚧
D.五味子
E.杏仁
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.
(90)是()
A.duplicating
B.crossing
C.overlapping
D.repeating