You are troubleshooting a one-way call problem with a Cisco 7920 wireless IP phone on a standalone WLAN. What may cause this problem？（） ["The minimum data rate is not set to 11 Mbps.","An address resolution protocol has been disabled","Publicly Secure Packet forwarding is enabled","The access point is set to the least congested channel."]
管钳的用途是什么？
汽油机功率大小的调节是通过改变（）的开度，从而改变进入汽缸内的（）来实现的，所以称之为量调节。
在沥青混凝土面层与水泥混凝土路面之问洒布的沥青材料薄层，称为（）。 ["透层","封层","粘层","复合层"]
试述螺纹联接预紧的目的。
应用型地理信息系统设计主要内容是什么？
