问题
选择题
— How many workers are there in your factory?
— There are two _____. [ ]
A. hundreds
B. hundred
C. hundred of
D. hundreds of
答案
答案：B
搜题请搜索小程序“爱下问搜题”
— How many workers are there in your factory?
— There are two _____. [ ]
A. hundreds
B. hundred
C. hundred of
D. hundreds of
答案：B
cZ(g)的影响，以X和Y物质的量之比为a∶