The cylinder liners are made of _____ and the cylinder surfaces are sometimes chromium-plated.

When the refrigeration demand is small,_______.

当柴油机燃用劣质燃油时，喷油器的冷却介质多使用（）。

In fighting a fire in a fuel tank, the FIRST action you should attempt is to _____.

Rudder position is shown on the bridge by the .

The process during which liquid containing a reasonable amount of sensible heat at a particular pressure immediately changes into steam after admitted to a chamber at a lower pressure is called _____.