血循环中的IC为相对分子量小的复合物,其分子量通常为()。
A.等于19S
B.小于19S
C.小于29S
D.大于19S,小于29S
E.大于29S
参考答案:B
Most of the guests ______ to the party were from the same country. [ ]
A. invited
B. inviting
C. to invite
D. were invite
托收业务的基本当事人包括:()、()、()和()。