A:不填; ha
B:has; had
C:has; wa
D:was; had
⑴小心的____ ⑵危险____ ⑶走进____ ⑷乱扔垃圾____
⑸意味着____ ⑹禁止吃喝____
表示两个数相等的式子叫做比例