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【单选题】
下列关于 DNA 和 RNA 结构的说法,错误的是( )。A.
DNA 的一级结构是指核苷酸的种类、数量及排列顺序
B.
DNA 的二级结构呈现双螺旋结构
C.
原核生物的 mRNA 具有 5' 端帽子结构和 3' 端聚 A 结构
D.
tRNA 的二级结构呈“三叶草”结构
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【单选题】It was not the best result. But he was quite content ____ the improvement. So ____ gerat relief, he went to sleep.
A.
with, with
B.
with, on
C.
of, with
D.
of, on
【简答题】模具零件的基准不但是设计时标注尺寸、加工和测量时的依据,更重要的是装配时定位的依据。所以保持基准面或基准孔的原有 和 是十分重要的。
【单选题】Pip is first blessed with great expectations when _____:
A.
Miss Havisham gives Pip her inheritance.
B.
Miss Havisham requests that he come and play at her mansion.
C.
Joe gives him a job in the forge.
D.
He receives notification from Mr. Jaggers that he is to go to London.
【单选题】When making decisions, the expectations will cause the Captain to()
A.
make the best decision
B.
make a decision faster
C.
have difficulty finding or dealing with the environment change, and make bad decision
【单选题】下列有关阿司匹林的叙述不正确的是
A.
是花生四烯酸环氧合酶抑制剂
B.
具有酸性，能溶于氢氧化钠溶液中
C.
具有解热镇痛作用，不具有抗炎作用
D.
具有抗血小板作用，可用于血栓的预防和治疗
【单选题】When he visited Borneo, Martin
A.
had no fixed expectations.
B.
made a programme about life on the river.
C.
became more interested in filming old buildings.
【单选题】It was not the best result. But he was quite content_____ the improvement. So with great relief, he went to sleep.
A.
with
B.
on
C.
of
D.
in
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