A:FT增大,F不变
B:FT增大,F增大
C:FT增大,F减小
D:FT减小,F不变
我国____平原很容易发生春旱,长江中下游平原容易发生发____旱.
括号里最大能填几?
40×____<281
600×____<4600
____×700<2830
____×30< 920
— Can I take photos here?
— You'd better not. Look at the sign “______” .