高血压性视网膜病变（如图）可分为（）
A.三级
B.四级
C.五级
D.六级
E.以上都不对
参考答案：B
It's hard for Daniel and ________ to work without a car. [ ]
A. I to go
B. me to go
C. I going
D. me going
轴承常见故障有哪些？
