螺旋锚钻起动后怠速运转3min～5min，检查仪表是否运行正常；检查滑道机构和动力头是否运行正常，确认正常时才能工作。怠速运转时间不得超过（）min。
查看答案
Authentication for user data traffic is important, but so is authentication for IP voice traffic. The Cisco 830 802.1 feature provides an easier method for allowing IP voice traffic through the VPN, because it（）.
A. requires access lists to identify the voice traffic
B. can allow traffic from a device without 802.1X authentication, by MAC address
C. can allow traffic from Cisco IP phones by listening to their CDP advertisements
D. allows all packets marked with a ToS of 5 to bypass authentication
E. allows all IP voice packets to bypass authentication via stateful inspectio
以下哪个是ETL的实现方式（）
A. 储存过程
B. 数据转换
C. 元数据服务
D. 全文目录
微信支付 
支付宝支付