维系蛋白质一级结构的化学键是
A.氢键
B.疏水键
C.盐键
D.肽键
E.范德华力
参考答案:D
Often they give up sport, _________they have no time _______after their work.
A.saying, leaving
B.said, left
C.saying, left
D.said, leaving
下面对贷款业务分类正确的是( )。
A.商业贷款和个人贷款B.短期贷款和银团贷款C.集团贷款和个人贷款D.短期贷款和中长期贷款