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【单选题】
下列哪种制冷剂的特点是不含氯原子,ODP值为0,GWP也很低,大约0.25~0.26。A.
HFC12
B.
HFC13
C.
HFC14
D.
HFC134a
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举一反三
【简答题】Let A and B be 2x2 matrices, if |A|=2,|B|=3, then which of the following are true?A. B. C. D.
【单选题】I’m __________ tired __________ work, let’s have a rest.
A.
so…that…
B.
enouth…to…
C.
too…to…
【单选题】听力原文：Where shall we meet tomorrow? (11)
A.
Let's meet at seven.
B.
I'm not free.
C.
Let's meet at the school gate.
【简答题】听录音，选择你听到的句子。 ( ) 1. A. Let's eat. B. Let's drink. ( ) 2. A. I'm hungry. B. I'm thirsty. ( ) 3. A. This food is good! B. This juice is good! ( ) 4. A. What is it? B. How many? ( ) ...
【单选题】— Let me introduce myself, I’m Tom. — ________________.
A.
It is my pleasure.
B.
pleased to meet you.
C.
what a pleasure.
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