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单选题
The amount of fluid friction or internal friction inherent in a mineral lubricating oil is reflected as a measure of its （）.
A
specific gravity
B
viscosity
C
S E number
D
hydrolytic stability
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Smoother；lessC
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单选题What will NOT increase friction of a liquid flowing in a pipe and cause a loss of suction head?（）.A
Bends in the pipingB
Slowing the pumping rateC
Pipeline valvesD
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moisture emulsification of the bearing greaseB
insufficient circulation and overheating of the bearingC
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单选题The purpose of the wearing rings used in a centrifugal pump is to （）.A
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acidsB
additivesC
heatD
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dispersant additiveC
extreme pressure additiveD
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have excessive sensitivity to small speed changesD
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Mechanical distributionC
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单选题创建粒子与模型物体的碰撞之后，生成一个geoConnector节点，如果需要降低粒子碰撞模型之后的反弹程度，应该如何修改？（）A
提高geoConnector节点的tessellation Factor属性值B
提高geoConnector节点的resilience属性值C
降低geoConnector节点的resilience属性值D
提高geoConnector节点的friction属性值E
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考题
单选题Moving parts of machines and motor vehicles have to be _____ regularly to reduce friction.A
lubricatedB
fabricatedC
embeddedD
dictated
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