问题
选择题
--- my hat?
--- .[ ]
A. Where is; Yes, it is.
B. Where's; No, it isn't.
C. Where's; It's in the backpack
D. Is it; It's on the table
答案
答案：C
搜题请搜索小程序“爱下问搜题”
--- my hat?
--- .[ ]
A. Where is; Yes, it is.
B. Where's; No, it isn't.
C. Where's; It's in the backpack
D. Is it; It's on the table
答案：C
Fe3O4＋N2，则X的化学式为[ ]