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【单选题】
当反密码子的第1位碱基是I时，可与其配对的密码子第3位碱基是A.
A、G、U
B.
A、C、U
C.
A、C、T
D.
G、C、A
E.
G、C、U
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反馈参考答案：
举一反三
【单选题】A ( ) contract is a contract agreement in which an offeror promises to pay after the occurrence of a specified act. An insurance policy contract is an example of it.
A.
unilateral
B.
bilateral
C.
parol
D.
implied
【判断题】An oral contract is a spoken agreement that is as valid as a written contract.
A.
正确
B.
错误
【单选题】According to Contract Law, an contract is concluded through .
A.
offer and counter-offer
B.
enquiry and offer
C.
offer and acceptance
D.
enquiry, offer, counter-offer, and acceptance
【简答题】肋骨的编号方法是( )
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