已知椭圆和双曲线有公共的焦点，那么双曲线的渐近线方程是（）。 A.A B.B C.C

试述土地登记的原则。

When and where we are going to hold the ball _____. So we’d better wait until we _____.

A．is not announced; are informed

B．doesn’t announce; inform

C．are not announced; have been informed

D．don’t announce; have informed

下列何种情况不会出现代谢性酸中毒

A．高热

B．休克

C．长期不进食

D．持续大量呕吐

E．急性肾衰竭

有关群落演替顶极学说中，单元顶极论和多元顶极论有何异同点

检查妇女的身体，应当由女侦查人员或医师进行。 ( )