荀子著作“尧问篇”中说人曰：“孙卿不及孔子。”孙卿的学生义正辞严地反驳说：“是不然。

大于0.4，小于0.6的数[ ]

A．有1个    

B．有9个    

C．有无数个

进行风力目测时，观测到的现象为“树叶及小枝摇动不息，旗子展开。高的草，摇动不息”，此时风速应记录为________m/s。

A．3

B．4

C．7

常规干燥

IP multicasting is a set of technologies that enable efficient delivery of data to many locations on a network. Rather than making multiple copies of a message intended to be distributed to multiple recipients at the (71) of origin of a message, multicasting initially sends just one (72) and does not copy it to the individual recipients until it reaches the closest common point on the network, thereby (73) the bandwidth consumed. Network performance is significantly (74) because it isn’t bogged down with the processing and transmission of several large data fries; each receiving computer doesn’t have to (75) the transmitting server for the file.

A. pointB. bottomC. head D. sight

已知双曲线C的中心是原点，右焦点为，一条渐近线m：，设过点A(-3，0)的直线z的方向向量．

求双曲线C的方程；