生活垃圾转运站周边设置的绿化隔离带最小不能低于( )m。
A．2B．3C．4D．5
参考答案：B
解析： 《城市环境卫生设施规划规范》第4.2.3条。
---So hard_ in the past few months that he has made great progress in English.
---I can see that, only a few mistakes _____ in this exam.
A．has he worked; did he make
B．he has worked; he made
C．he has worked; has he made
D．has he worked; he made
清理突出的煤时，必须制定（）、（）、（）及（）、（）、（）的安全措施。
