单项选择题

肽链中的氨基酸是通过酯键连接的。
A、正确
B、错误

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不定项选择

排序要求数据一定要以顺序方式存储。

A.正确
B.错误

单项选择题

Perils of the sea, such as vessel being stranded or grounded covered in an insurance policy are one kind of ( ).

A.natural calamities
B.fortuitous accidents
C.general extraneous risks
D.special extraneous risks