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【简答题】
空气中的病原微生物可引起____感染或____感染;空气中非致病菌,可造成医药制剂、生物制品及培养基等的____。
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反馈参考答案：
举一反三
【单选题】For binary tree, there are three kinds of traversal modes, and the main difference between these traversal modes is the priority to visit root. Which is the postorder traversal mode? ( )
A.
Root-LeftChild-RightChild
B.
Root-RightChild-LeftChild
C.
LeftChild-Root-RightChild
D.
LeftChild-RightChild-Root
【单选题】At the isoelectric pH of a tetrapeptide:
A.
only the amino and carboxyl termini contribute charge.
B.
the amino and carboxyl termini are not charged.
C.
the total net charge is zero.
D.
there are four ionic charges.
E.
two internal amino acids of the tetrapeptide cannot have ionizable R groups.
【简答题】There are many kinds of ants in America. One kind is very strong. People are afraid of it. These ants move in a large group. They eat all the animals on their way. They can kill and eat elephants, and...
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