Boiler shell: Our company chose high quality anti-slip stainless steel , which has more effective insulation than electro-static painting and ordinary galvanized sheets, having a relatively low protective effect on the boiler shell temperature, beautiful exterior.

The auxiliary lube oil pump is started and stopped auto- matically by a pressure switch in the discharge piping of the main oil pump. The auxiliary oil pump ... canteach.candu.org/library/20051017.pdf -

0 có gì sai hết: be good/bad at noun/ V-ing (expression nó là như vậy)