I'm too nervous to give a talk in front of so many people. _________, Maria. I think you can make it.
A:That's true
B:With pleasure
C:Come on
D:You're right
人口自然增长率为( )
下列关于质粒的叙述,正确的是
北京球迷杨洋深夜收看在美国当地中午举行的一场NBA篮球比赛现场直播.造成两地时间差异的原因是( )
如图,椭圆E:x2a2+y2b2=1(a>b>0)的离心率是22,点P(0,1)在短轴CD上, 且PC→·PD→=-1.