无效建设工程合同的确认权归（）。 A.建设行政主管部门 。 B.人民法院 。 C.仲裁机构 。 D.工商行政管理部门 。 E.监理单位。
从铁路来说，整个生产过程必须对旅客和货主的生命财产负责，尽可能的满足他的旅行和（）需要。 A.安全。 B.运输。 C.生理。 D.心理。
It has become necessary to configure an existing serial interface to accept a second Frame Relay virtualcircuit.Which of the following processes are required to accomplish this task？（） configure static frame relay map entries for each subinterface network.。 remove the ip address from the physical interface。 create the virtual interfaces with the interface command。 configure each subinterface with its own IP address。 disable split horizon to prevent routing loops between the subinterface networks。 encapsulate the physical interface with multipoint PPP。
The command frame-relay map ip 10.121.16.8 102 broadcast was entered on the router. Which of the following statements is true concerning this command？（） This command should be executed from the global configuration mode.。 The IP address 10.121.16.8 is the local router port used to forward data.。 102 is the remote DLCI that will receive the information.。 This command is required for all Frame Relay configurations.。 The broadcast option allows packets， such as RIP updates， to be forwarded across the PVC。
打桩的控制原则是什么？
如下图所示，正弦交流电的有效值为（）mV。
