不同地区(城市、农村及城乡结合部)蚊虫防治的原则是什么?
参考答案:
城市地区以清除和管理孳生地为主,农村地区以杀灭成蚊和防蚊为主、城乡结合部将孳生地控制和杀灭成蚊结合起来
3. He played on the _____ for two hours and when he returned he found half his goods _____ stolen.
A.sand; were
B.sand; was
C.sands; were
D.sands; was
采取公开拍卖形式时,竞买人不足( )人时,主持人应当终止拍卖。
A.3
B.5
C.7
D.9