The size of the discharge ring used for the efficient operation of a disk type purifier is dependent upon the（）
1、The purpose of the wearing rings used
The purpose of the wearing rings used in a centrifugal pump is to （）.Aprevent an internal explosion in the pump when it is overheatedBenable...
2、The valve on the discharge side of a c
The valve on the discharge side of a cargo pump on a tanker will usually be a（）.Abutterfly valveBspectacle valveCcheck valveDglobe valve
3、The film of oil between the rings and
The film of oil between the rings and the liner is not only essential for the lubrication but also plays an important part in achieving （）.Aan oil sealBremoving heatCa gas sealDcooling the pisto
4、A facility used for the discharge of a
A facility used for the discharge of a cargo of a particular hazard，such as chlorine，butane or ethane，must have what to warn water traffic ...
5、The valve on the discharge side of a c
The valve on the discharge side of a cargo pump on a tank vessel will usually be a（）.Abutterfly valveBspectacle valveCcheck valveDglobe valve
6、The four standard light colors used fo
The four standard light colors used for lighted aids to navigation are red，green，white，and （）.ApurpleBorangeCblueDyellow