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【多选题】
构成蛋白质的氨基酸有 [填空(1)] 种，一般可根据氨基酸侧链(R)的大小分为 [填空(2)] 侧链氨基酸和 [填空(3)] 侧链氨基酸两大类。其中前一类氨基酸侧链基团的共同特怔是具有 [填空(4)] 性；而后一类氨基酸侧链(或基团)共有的特征是具有 [填空(5)] 性。碱性氨基酸(pH6～7正电)有三种，它们分别是 [填空(6)] 、 [填空(7)] 和 [填空(8)] ；酸性氨基酸也有两种，分别是 [填空(9)] 氨基酸和 [填空(10)] 。A.
20
B.
非极性
C.
极性
D.
疏水
E.
亲水
F.
赖氨酸
G.
精氨酸
H.
组氨酸
I.
天冬氨酸
J.
谷氨酸
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【单选题】—I called you yesterday evening, but there was no answer. —Oh, I’m sorry. I ________ dinner in my friend’s home.
A.
have
B.
will have
C.
was having
D.
have had
【简答题】市场营销理念的演变经历了哪几个阶段?
【简答题】什么是贸易术语( trade terms )?其所用是什么?买卖合同中一定要用贸易术语吗?
【简答题】市场营销观念演变经历了哪几个阶段?选出你印象最深的一种,做简单介绍。 市场营销组合理论有哪三种?每种分别是站在谁的角度提出的?
【简答题】完形填空。 When I was young, I liked to play jokes on people I knew, especially on my parents and friends. One day my mother was 1 and I was playing with my younger brother Tony. Suddenly I ran to my mothe...
【单选题】—I called you yesterday evening, but there was no answer. —Oh, I'm sorry. I _______ dinner at my friend's home. [ ]
A.
had
B.
was having
C.
have had
【单选题】---I called you yesterday evening, but there was no answer. ---Oh, I am sorry I _____dinner at my friend’s house.
A.
have
B.
had
C.
was having
D.
have had
【简答题】贸易术语(Trade terms)
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