减少（Reduction）

1、In using reduction gears to obtain eff

In using reduction gears to obtain efficient propeller speeds, （）.Athey must be located at the after end of the engineBthey can only be used...

2、The sudden reduction of pressure occur

The sudden reduction of pressure occurring within the crankcase of a refrigeration compressor during starting causes the （）.Asudden evaporation ...

3、消声sound attenuation；moise reduction so

消声sound attenuation；moise reduction sound deadening

4、Pitted reduction gear teeth having a d

Pitted reduction gear teeth having a deep blue color with evidence of overheating have been operated with （）Aexcessive speedBimproper warm-upCextreme misalignmentDinadequate lubricatio

5、When transmitted by a reduction gear,

When transmitted by a reduction gear, diesel engine speed is reduced and the torque available for work （）Aremains the sameBis reducedCis increasedDis eliminated

6、“3R”指的是Reduction：：“（）”、Replacement：“（）

“3R”指的是Reduction：：“（）”、Replacement：“（）”、Refinementt：“优化”。