角膜的屈光力约为()晶状体的屈光力约为()
A.43D
B.42D
C.41D
D.19D
E.18D
参考答案:A,D
We have decided to fulfill the task in time, difficulties we may meet with.
A.no matter how
B.however
C.whatever
D.whichever
在全国鲜切花生产经营综合实力中()居全国首位。
A.上海
B.广州
C.福建
D.云南