锅炉热效率是表明锅炉热经济性的指标,一般工业燃煤锅炉热效率在( )左右。
A.50%~72%
B.50%~82%
C.60%~72%
D.60%~82%
参考答案:D
—______. [ ]
A. How are you?
B. Welcome to China.
C. Nice to meet you.
D. I'm fine, thanks.
2. — ______. Are you Jane?
— ______. [ ]
A. Excuse me, Yes, I am
B. I'm sorry, No, I'm not
C. Excuse me, No, she isn't
D. I'm sorry, Yes, she is
3. — Nice to meet you.
A. Nice to see you.
B. Nice to meet you.
C. How do you do?
D. See you later.
4. — Good-bye, Miss Zhang.
— ______.[ ]
A. Hello, Mr Liu.
B. See you later, Mr lee.
C. Good morning, Mr Chen.
D. Let's go, Mr Zhou.
5. — You are very beautiful today.
A. Thanks.
B. Me, too.
C. Where, where.
D. Not nice.
发动机VTEC的作用是()。
A.解决低转速转矩
B.解决高转速动力
C.具有良好的怠速稳定性
D.以上答案全对