低压氨气管等，为防止产生“冷桥”减少冷损失，通常在管道和支架间设以用油浸过的木块。
参考答案：对
接入网
In the following essay, each blank has four choices. Choose the most suitable one from the four choices and write down in the answer sheet. Heterogeneous network environments consist of computer systems from (66) vendors that run (67) operating systems and communication protocols. An organization that (68) its computer resources is usually (69) the task of integrating its heterogeneous systems. Typically, each deparlment or division has defined its own network needs (70) OS, LAN topology, communication protocols, applications, and other components.
A．same
B．similar
C．different
D．difference
