题型:问答题 简答题 My sister has worked as an engineer since she _____ back from the United States.[ ]A. came B. had come C. comes D. has come 查看答案
题型:问答题 简答题 根据《2GHzTD-SCDMA数字蜂窝移动通信网工程验收暂行规定》,电源线的布放应符合以下要求()。A.设备的馈电母线规格应符合工程设计要求,电源线的布放应排列整齐,美观,不得有交叉,连接良好B.采用电力电缆的电源馈电母线,应是整条电缆线料,严禁中间接头C.铠装电力电缆弯曲半径应≥10倍线缆外径D.塑包电力电缆弯曲半径应≥6倍线缆外径 查看答案