drainage

Can natural rubber be used in irrigation and drainage hoses？

The Missouri drainage area covers one-sixth of the entire United States.

What is the unique system of underwater irrigation and drainage in Xinjiang Province?

Can natural rubber be used in irrigation and drainage hoses？ A: 正确 B: 错误

The __________ system here, including a water-closet, is of the mostcomplete and modern kind. A: climate B: topographical C: water D: drainage

Please find the word that is equivalent to the definition.fit for drinking（） A: sewage B: vegetation C: potable D: drainage E: waterlogged F: sedimentG．habitatH．erosion

To improve the （）is regarded as a good method to increase the farmer's income in the south part of the country. A: sewage B: drainage C: aqueduct D: archway

Which one of the following would be the characteristic features of a karst landscape? A: caves B: drumlins C: lack of surface drainage D: sinking streams E: sinkholes

You must take good care of the drainage cock of the air control systemBecause （） leads scale formed which might malfunction the pilot control valve and other instruments.