标准气钢瓶中组分的沸点、粘度相差较大时,钢瓶应定期()。
A、滚动
B、倒置
C、更换
D、试压
参考答案:B
阅读理解。
Hello! I'm Ren Lijuan. R-E-N, Ren. L-I-J-U-A-N, Lijuan. I'm ten and I'm a student. I'm in Class 6,
Grade 4. Lei Hao is my classmate (同班同学). He likes baseball. Miss Niu is my English teacher. She
is a good teacher and we all like her.
1. Can you spell the name Ren Lijuan?
A. Yes, I am.
B. Yes, I can.
C. No, she can't.
2. How old is Ren Lijuan?
A. He is ten.
B. I'm ten.
C. She is ten.
3. What class is she in?
A. She is Class 4.
B. She is in Grade 6.
C. She is in Class 6.
4. Is Miss Niu her English teacher?
A. She is her teacher.
B. Yes, he is.
C. Yes, she is.
5. Does Lei Hao like baseball?
A. Yes, he does.
B. No, he doesn't.
C. I don't know.
两旧胎拼装时,两轮胎的磨耗差距不能超过30mm