视频监控系统可由交流供电回路和其他用电回路合并用电。
查看答案
视距较小而视角较大的电梯内可选用
A. 定焦镜头
B. 变焦镜头
C. 广角镜头
D. 光圈可调镜头
传输线缆与钢管敷设的电力线缆平行或交叉敷设时，其间距不得小于()米
A. 0.2
B. 0.3
C. 0.5
D. 1
听Call1电话录音，判断该电话谈话主题与以下哪项相关_________？
A. One of the common ruses: posing as a reporter, posing as a conference organizer wishing to send literature to product managers; and pretending she’s a Pac Bell technician stuck up on a telephone pole outside the building, who needs to verify extensions.
B. One of the ruser’s favorites is calling a company operator and saying, “last night I was playing tennis and got in a doubles game with a programmer from Netscape. I gave him a ride home, but he left his tennis racquet in my car. Now I can’t remember his name. Dave or Don or something.”
微信支付 
支付宝支付