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.

Distilled water is now largely used on board, this may ...

单项选择题Distilled water is now largely used on board, this may be corrosive (due to presence of dissolves CO₂) and （） to the taste.

The domestic fresh water pump starters are controlled b...

单项选择题The domestic fresh water pump starters are controlled by pressure switches which operate when the pressure in the tank varies within predetermined limits as water is drawn offThe word “which” means （）.

In general, domestic flesh water tank kept under pressu...

单项选择题In general, domestic flesh water tank kept under pressure by an external supply of （）.