【单选题】YL-335B外部供电电源为()AC 380V/220V。
【单选题】社会心理学家欧文•戈夫曼认为:人的社会交往是一个( )的过程
【单选题】Local persons display their handicrafts on the wayside.
【单选题】YL-335B外部供电电源为()AC380V/220V。
【多选题】What's the difference between signal wayside safety relay and nomal relay?
A.
signal safety relay use gravity principle.
B.
if safety relay failure ,front contact close.
C.
we can use normal relay to replace safety relay.
D.
safety relay have large volume.
E.
onborad signal equipment can use wayside safety relay.
【单选题】Local craftsmen display their handicrafts on the wayside.
【简答题】某建筑面积为 23000m2的18层住宅工程,施工现场供、配电干线采用架空线路敷设,支线及进楼电源采用铠装电缆直埋。 (1)该背景中明敷绝缘导线长期连续负荷允许载流量为215A.架空线路短路保护采用熔体额定电流200A的熔断器,该方案是否可行?为什么? (2)材料部门采购了四芯铠装电缆到现场,技术部门为了保证TN-S三相五线制供电,决定采用四芯铠装电缆外敷一根塑铜线(BV)方式敷设,是否可行? (...
【判断题】社会心理学家欧文.戈夫曼认为人的社会交往是一个自我表演的过程。( )
【单选题】The phrase 'fall by the wayside' (Para. 2) most probably means _____.
【简答题】What's the structure of signal wayside safety relay?