When an air started, four-stroke/cycle diesel engine is being cranked, the starting air is admitted to each cylinder during what would normally be the（）

A.When heated, it will move proportional to the amount the metal has lengthened or expanded
B.The pointer associated with the pyrometer scale can be made to also measure engine RPM
C.It can be utilized in exhaust manifolds and heat exchangers interchangeably
D.It can indicate temperature at a distant point from the source heat

A.Low compression pressure and high exhaust temperature
B.Low firing pressure and high exhaust temperature
C.Low compression pressure and low exhaust temperature
D.Low firing pressure and low exhaust temperature

A.later and close sooner
B.sooner and close later
C.sooner and close sooner
D.later and close later