海船船员 2021_08_24 每日一练
下列关于电阻应变效应不正确的说法是______。
A.电阻应变效应是电阻受外力作用变形引起的
B.电阻受外力作用拉伸,阻值增大
C.电阻应变效应和电阻的材料无关
D.电阻应变效应和该电阻施加的电压无关
In a diesel engine closed freshwater cooling system, the amount of coolant flowing through the heat exchanger is controlled by the __.
A.suction pressure regulator
B.thermostatic bypass valve
C.sea water temperature
D.water level in the expansion tank
在对减速齿轮箱进行拆检时,若发现齿轮啮合面有径向划痕,一般是()所致,应采取的措施是()。
A高温腐蚀/应更换滑油
B滑油中含有硬质细粒/应加强净化并勤洗滤器
C疲劳磨损所致/应降低负荷
D齿轮啮合面硬度不够/应对齿轮进行热处理