A:扁鹊
B:张仲景
C:华佗
D:孙思邈
As we know, water is very important _______ us.
体积是____ cm3
选修4-4:坐标系与参数方程
在直线坐标系xOy中,曲线C1的参数方程为 {x=acosty=1+asint (t为参数,a>0).在以坐标原点为极点,x轴正半轴为极轴的极坐标系中,曲线C2:ρ=4cosθ.
根据拼音写汉字:
hān
shū
xiē
____睡 稀
____ 间
____