The suction - force principle of opera

1、Pitting in the suction areas of a cent

Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by （）.AcavitationBelectrolysisCabrasionDcorrosio

2、In the presence of external forces，the

In the presence of external forces，the center of buoyancy of an inclined vessel is vertically aligned with the（）.Acenter of gravityBmetacenterCcenter of flotationDkeel

3、They are the principles, many of them,

They are the principles, many of them, （）I learned at my mother’s knee.AwhichBthatCwhatDhow

4、According to the principle of CRC calc

According to the principle of CRC calculation, given a frame-bit series M=11100111 and the multiple-term formula, frame-bit series generated by the CRC G=110011, then the CRC isA111101B00011C11010011D1101001

5、The principle of separation by which a

The principle of separation by which all commercially available oily water separators function is （） differential between oil and water.Athe temperatureBthe viscosityCthe gravityDthe size

6、In the absence of external forces，the

In the absence of external forces，the center of buoyancy of an inclined vessel is vertically aligned directly below the（）.Acenter of gravityBamidships stationCcenter of flotationDgeometric center of the waterplane area