A:they find many mistakes in the report
B:lots of mistakes have been made in the report
C:there are plenty of mistakes in the report
D:the report is full of mistake
观察、分析实验现象,可以帮助我们理解科学的本质。下列现象描述正确的()
等轴双曲线C的中心在原点,焦点在x轴上,C与抛物线y2=16x的准线交于A,B两点,AB=43,则C的实轴长为( )