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【单选题】
本征半导体中,自由电子和空穴的数目是:A.
不等
B.
相等
C.
自由电子大于空穴的数目
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举一反三
【简答题】Say whether the following statements are ture or false. Sally goes to the chemist's to get her prescription filled. Chemist: Good morning. Sally:Good morning. Chemist: Can I help you? Sally: Oh yes. I...
【单选题】听力原文：Woman: Good morning. I’m calling about your advertisement in Stationery News looking for overseas distributors. Could you send me some more details about this, as I’m very interested in this oppo...
A.
to ask for advice
B.
to explain an error
C.
to ask for a decision
D.
to ask for information
E.
to make a complaint
F.
to request help
G.
to confirm details
H.
to express thanks
【简答题】John Good morning. We’re here to see Diane Kennedy at 10 o’clock . Sally Can I ____ ____ ____ , please?
【简答题】Sally Johnes is one of Dr Hehn's patient's. She is going on holiday to the Caribbean and need immunization against hepatitis A. Before the doctor gives Sally the injection, she ask Anna to do a blood ...
【简答题】Say whether the following statements are ture or false. Sally Jones is one of Dr Hehn's patient. She is going on holiday to the Caribbean and needs immunization against hepatitis A. Before the doctor ...
【单选题】“_____________________________” “Good morning. George Clancy’s office, please.” “One moment.”
A.
Hello?
B.
Good morning, Bright Lights Design.
C.
Sally speaking.
【简答题】Complete the dialogue with the verbs below. ANNA Good morning. SALLY Good morning. I'm Sally Jones. I have a n appointment for a blood test. ANNY Oh yes, Ms Jones. Would you like to go straight into t...
【单选题】当下列反应的容器的体积变化时,平衡基本不受影响的是:
A.
N 2 (g)+3H 2 (g) ⇌ 2NH 3 (g)
B.
H 2 O 2 (l) ⇌ H 2 O (l)+1/2O 2 (g)
C.
H 2 (g)+I 2 (s) ⇌ 2HI(g)
D.
N 2 (g)+O 2 (g) ⇌ 2NO(g)
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