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【简答题】
肽链的主链上____中的____具有部分双键的性质，因而不能自由旋转，使肽键上的4个原子____与相邻2个____共处一个平面上，后两者是在平面的2个对角，呈反式构型，该构型就是肽单元。
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【简答题】天线水平波瓣角()多用于密集城市地区典型基站三扇区配置的覆盖 A30° B65° C90° D105°
【单选题】________ boasted of her superiority to Leto because she had fourteen children seven male and seven female, while Leto had only two.
A.
Psyche
B.
Myrrha
C.
Niobe
D.
Medusa
【单选题】紫外-可见分光光度法的定量依据是（）
A.
Lambert-Beer定律
B.
Molisch定律
C.
Kober定律
D.
Matol定律
E.
Elson-Morgan定律
【单选题】. She had only twenty dollars left, _____ to buy her two children Christmas presents.
A.
in which
B.
with which C with that D. in that
【简答题】天线水平波瓣角()多用于密集城市地区典型基站三扇区配置的覆盖 A0° B5° C0° D05°
【单选题】My sister had a(n)______for music when she was only two years old.
A.
ability
B.
intelligence
C.
interest
D.
talent
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