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【单选题】
难溶强电解质BaCO 3 在下列溶液中溶解最多的是( )。A.
HAc
B.
纯水
C.
BaCl 2
D.
Na 2 CO 3
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举一反三
【单选题】In which of the following groups is the discovery of new species not mentioned in the passage?
A.
Birds.
B.
Monkeys.
C.
Trees.
D.
Freshwater fish.
【单选题】In which of the flollowing groups is the discovery of new species not mentioned in the passage?
A.
Birds
B.
Monkeys
C.
Trees.
D.
Freshwater fish.
【单选题】In terms of species, which of the following biologist holds that species are immutable ?
A.
Carl von Linné
B.
Jean-Baptiste Lamarck
C.
Charles Robert Darwin
D.
Theodosius Grygorovych Dobzhansky
【简答题】革兰氏阳性菌细胞壁的主要成分为______和______，而革兰氏阴性菌细胞壁的主要成分则是______、______、______和______。
【多选题】In most cases, the aim of genetic engineering is to introduce a new trait to the plant which does not occur naturally in the species, which include:
A.
resistance to certain pests, diseases, or environmental conditions
B.
reduction of spoilage
C.
resistance to chemical treatments (e.g. resistance to a herbicide)
D.
improving the nutrient profile of the crop
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