填料函式密封装置具有（）等优点。Ⅰ.结构简单；Ⅱ.价格低廉；Ⅲ.工

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价格低廉(low price)、填料函式

[单选题]填料函式密封装置具有（）等优点。Ⅰ.结构简单；Ⅱ.价格低廉；Ⅲ.工作较可靠；Ⅳ.维护管理方便；Ⅴ.易于检修。

A. Ⅱ＋Ⅲ
B. Ⅰ＋Ⅱ＋Ⅳ＋Ⅴ
C. Ⅲ＋Ⅳ＋Ⅴ
D. Ⅰ＋Ⅲ＋Ⅳ＋Ⅴ

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学习资料：

[单选题]合成材料艉轴承中以（）艉轴承应用日益增多。

A. 尼龙
B. 赛龙
C. 环氧树酯
D. 塑料

[单选题]Improper maintenance of an automatic auxiliary boiler oil burner could result in （）.

A. fuel pump failure
B. fan motor failure
C. increased feedwater consumption
D. decreased boiler efficiency

[单选题]Auxiliary boilers are divided into several classifications, one of which is （）.

A. water-tube supercritical circulation
B. water-tube forced circulation
C. fire-tube controlled circulation
D. fire-tube express circulatio

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