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
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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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 ( ).
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