患者女性，43岁，患风湿性心脏病二尖瓣狭窄15年，伴心房颤动1年余。患者在做家务时突然发生下腹部剧

A.A large change of viscosity occurs with a minor change in temperature

B.No change in viscosity occurs with any change in temperature

C.Very little change in viscosity occurs with a significant change in temperature

D.The viscosity of the oil increases with an increase in temperature

A.high temperature and a high viscosity

B.high temperature and a low viscosity

C.low temperature and a high viscosity

D.low temperature and a low viscosity

Diesel engine lube oil diluted with fuel oil is indicated by________.

A.decreased viscosity

B.decreased pour point

C.increased flash point

D.increased viscosity

Kinematic viscosity (运动粘度)=0.5 m2/s，thermal diffusivity（热扩散率）=0.2 m2/s, then Pr=（）

A.temperature

B.pumping rate

C.pressure

D.heat

The viscosity of an oil is a measure of its _____.

A.weight

B.internal friction

C.demulsibility

D.S.A.Enumber

A.in order that

B.because of

C.in order to

D.owing to

The viscosity, plasticity or elasticity of Electrorheological (ER) and magnetorheological (MR) fluids change with variations in the application of either current or magnetic fields.