It is necessary to remove （） from the cooling spaces.
举一反三
- When to remove scale from the cooling spaces， acid solution （） in the system can be tested from time to time by putting some on to a piece of lime.
- The purpose of the engine's cooling system is to remove excess heat from the engine, to keep the engine operating at its most efficient temperature,and to get the engine up to the correct temperature as soon as possible after starting.
- Vents are led from the engine to head tank （） from the cooling water.
- remove the dust from
- Heat the soup for ten minutes, and then _______from the stove. A: you should remove it B: removing it C: to remove it D: remove it