问题：
[单选题]In a domestic fresh water system, the pump starters are controlled by （） switches which operate when the pressure in the tank varies within predetermined limits as water is drawn off.
A、water level
B、water flow
C、temperature
D、pressure
参考答案：
D
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- ● Dometic water pump i tarted automatically by （） which operate a the water level fall to a predetermined level.
- ● When the denity of water i 1000,i.e.in freh water and in ummer zone a hip may load to the upper edge of the line marked（）.
- ● The motor for the freh water pump （）.
- ● If the water level dropped rapidly in the expanion tank of a cloed dieel engine cooling water ytem, you hould upect a （）.
- ● In an auxiliary boiler team and water ytem, the highet preure will be in the （）.
- ● （） allow for expanion and water make up in the water cooling ytem.
- ● There i （） in any water cooling ytem for a dieel engine allowing for expanion and water make-up in the ytem a well a air vent and chemical addition.
- ● Oil preure in the lubrication ytem i （） the tatic ea water head to enure that ea water （） the tem-tube.
