影响除灰管道磨损的主要因素有哪些?
参考答案:
影响除灰管道磨损的主要因素有:
(1)灰渣颗粒尺寸;
(2)灰渣颗粒硬度和形状;
(3)输送灰渣的浓度;
(4)管道流速。
Circuit-switching technology is used in Publish Switched Telephone Network(PSTN), Global System for Mobile Communications(GSM) and code Division Multiple Access (CMDA) . It is a ( ) information transfer mode.
A. connection oriented
B. connectionless
C. high bandwidth utilization
D.poor real-time
直流电源的电力电缆,应分开布放;电源线应与信号线缆分开布放,避免在同一线束内。如果无法分开,应采取护套等相应的保护措施