Nowadays, we still see some ________ begging for money in the street from ________.[ ]

A. woman beggars; passers-by

B. woman beggars; passer-bys

C. women beggars; passers-by

D. women beggars; passer-bys

对于任何一种管内液流或气流，任何流态都可以确定出一个雷诺数值。