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【单选题】
下列分子的空间构型为平面三角形的是（）A.
NH3
B.
NCl3
C.
BF3
D.
PCl3
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】Can you fit me into your ________ on Tuesday afternoon? I’m available the whole afternoon.
A.
scheme
B.
schedule
C.
schema
D.
schism
【简答题】Can you fit me into your s____ Tuesday afternoon?(日程)
【单选题】听力原文：W: Can you tell me when I can get an appointment for my daughter's dental check-up? M: Let's see, Dr. Wilson is fully hooked for Monday and Tuesday, and for Thursday morning. He's taking Wednesda...
A.
Tuesday morning is available.
B.
Wednesday morning is available.
C.
Thursday morning is available.
D.
Friday morning is available.
【单选题】Can you fit me into your _________ Tuesday afternoon?
A.
schedule
B.
appointment
C.
free
D.
confirmed
E.
data
F.
blog
G.
tiring
【简答题】Susan: Where are you going to keep all the __1__ and ledgers? Mathews: Everything will either be in the computer or in one of these two __2__ . Susan: You can fit everything into two drawers of...
【单选题】在气相色谱法中，分离度定义为
A.
相邻两组分色谱峰保留值之差与两峰底宽度平均值之比
B.
相邻两组分色谱峰保留值之和与两峰底宽度平均值之比
C.
相邻两组分色谱峰保留值之差与两峰底宽度平均值之积
D.
相邻两组分色谱峰保留值之和与两峰底宽度平均值之积
E.
相邻两组分色谱峰保留值之差与两峰底宽度之和之比
【单选题】听力原文：M: Can you tell me when I can get an appointment for my son's dental checkup? W: Let's see. The dentist is fully hooked for Monday and Tuesday, and for Wednesday morning. He is taking Friday off....
A.
Boss and secretary.
B.
Dentist and patient.
C.
Passenger and ticket seller.
D.
Patient and nurse.
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