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【单选题】
胃蛋白酶原是由下列哪种细胞分泌的A.
胃腺的主细胞
B.
胃腺的粘液细胞
C.
胃腺的壁细胞
D.
幽门腺的G细胞
E.
胃腺的上皮细胞
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举一反三
【单选题】What can we learn about the device designed by David Whitten and Kirk Schanze?
A.
The two layers of polymers are charged differently.
B.
The empty capsule they designed is used to trap mouse.
C.
The absorbed-light can kill bacteria inside the capsule directly.
D.
Singlet oxygen is an insulated form. of element.
【简答题】欲辟土地,朝秦楚,莅中国而抚四夷也《孟子·齐桓晋文之事》)
【简答题】In order to learn a foreign language well，four things are necessary． First，we must understand the language when we hear it spoken．Secondly, we must be able to speak it ourselves, with confidence and w...
【简答题】We found that it was important to learn English． We found it ______ to learn English．
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