新油注入设备24h的油样洁净度：≤NAS（）级。
A.10
B.7
C.8
参考答案：B
I want to help the people who are sick, so I want to be a _______.[ ]
A. worker
B. teacher
C. waiter
D. doctor
大乐观
ant to help the people who are sick, so I want to be a _______.[ ]