例句與造句

1. Water supplying pipe in front of the coal economizer should be installed with a stop valve and check valve for the factory using boiler of mother tube water supplying
   7采用母管制供水的電廠，進(jìn)入每臺(tái)鍋爐省煤器前的給水支管均應(yīng)裝設(shè)截止閥與逆止閥。兩閥應(yīng)緊接，按水流方向逆止閥在前。
2. It's difficult to find coal economizer in a sentence. 用coal economizer造句挺難的