不是钙的生理功能的是A．维持体液酸碱平衡B．参与血液凝固过程C．参与胶原蛋白合成D．构成骨骼和牙齿

A.high fuel oil viscosity

B.low fuel oil temperature

C.high lube oil viscosity

D.energized glow plugs

A.use of low viscosity oil in cold weather

B.increased moisture content of inlet air in cold weather

C.increased drag of pistons and bearings due to increased oil viscosity

D.higher compression pressures reached due to smaller clearances existing in the engine during cold weather

A.increasing the quantity of starting air

B.increasing the lube oil pressure

C.heating the engine fuel supply

D.heating the engine coolant

Cold weather starting of a diesel engine may be made easier by .

A.decreasing the compression ratio

B.using a special fuel having a high ignition temperature

C.increasing the starting air supply

D.heating the jacket water

A.increasing the quantity of starting air

B.increasing the lube oil pressure

C.heating the engine fuel supply

D.heating the engine jacket water

An electric heater built into some smaller diesel engines is used to _____.

A.raise lube oil viscosity for easier starting in cold weather

B.increase air inlet temperature

C.increase compression ratio

D.increase jacket water temperature for easier starting in cold weather

Fuel oil having a low cetane rating could result in________.

A.improved cold weather starting

B.excessive fuel oil consumption

C.reduced ignition lag

D.smoother engine operation

eather.

B．Heat has less effect on people's intelligence than the cold does.

C．People are more intelligent on cloudy days.

D．Temperature has nothing to do with people's intelligence.