维持蛋白质基本骨架的是
A.共价键 B.氢键 C.高能键 D.磷酸二酯键 E.肽键
参考答案:E
—Where is Sally from , Mike ? —
A.I am from China.
B.She is from America
C.He is from England
D.You are from Japan
什么是干燥?