Which of the following expressions can be used for agreeing with somebody?
A. I couldn't agree more.
B. Absolutely
C. You have a very good point there.
D. Exactly
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Which of the following expressions can be used for disagreeing with somebody?
A. I'm afraid I can't agree with you on this matter.
But all the evidence suggests that...
C. I see what you mean, but...
D. I totally agree.
Which of the following expressions can be used for inviting somebody to a dinner?
A. Wanna come over for dinner on Saturday?
B. Would you like to come over for dinner on Saturday?
C. I was just wondering if you would like to come for dinner on Saturday.
D. Sure. What time?
Which of the following expressions can be used for declining an invitation?
A. Thank you very much, but I'm busy on Saturday.
B. Love to. What can I bring?
C. That's very kind of you, but I already have plans for Saturday.
D. Oh, certainly! Thank you. Should I bring anything?
用下列两种方法(1) 使高温热源的温度T1升高ΔT；(2) 使低温热源的温度T2降低同样的值ΔT，分别可使卡诺循环的效率升高Δη1和Δη2，两者相比,
A. Δη1>Δη2
B. Δη1<Δη2
C. Δη1=Δη2
D. 无法确定哪个大
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