散装填料根据结构特点不同,又可分为环形填料、()、环鞍形填料及球形填料等。
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具有氧化性的货物,在包装时应使用有机材料作为衬垫。
A. 正确
B. 错误
In boilers, besides maintaining the burner atomizers, air diffuser vanes, fuel temperature, forced draft fan, fuel pump and other hardware in good condition, there are some adjustments on the ()that can produce a good flame for the most efficient operation.
A. fuel-air ratio
B. compression ratio
C. fuel rack
D. viscosity index