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【单选题】
限制性核酸内切酶可对()A.
双链DNA的特异性部位进行切割
B.
单链DNA的特异性部位进行切割
C.
多肽链的特异性部位进行切割
D.
mRNA的特异性部位进行切割
E.
双链DNA的任意部位进行切割
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举一反三
【简答题】Engineers had a better choice of material, ______________ (当新发明被投入使用以后).
【单选题】If a better material______, the strength of the part would have been increased.
A.
had been used
B.
had been using
C.
being used
D.
using
【单选题】A ) It looks unusual. B) It transforms. C) It uses better material. D) It is a new product.
A.
It looks unusual.
B.
It transforms.
C.
It uses better material.
D.
It is a new product.
【简答题】Developing school skills Books to help you to become better teachers or better learners These materials can help both teachers and students of different levels and grades. Reading and Langua...
【单选题】If a better material______, the cost of the product would have been decreased.
A.
had been used
B.
had been using
C.
being used
D.
using
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