问题：
[单选] Please draw out a 01 mm （） between the two halves of the bearing to reduce the clearance.
shim。gasket。washer。packing。
问题：
[单选] Put in the engine turning gear Now examine thoroughly inside the crankcase to （） that everything is correct.
make sure。be sure。assure。believe。
问题：
[单选] Remote control means that the system is being controlled by the operator who is situated （） from the system.
automatic。local。remote。manual。
问题：
[单选] Rotating flyweights acting against spring pressure make a simple type of （）.
governor。safety valve。reducing valve。feed water regulator。
问题：
[单选] Scavenging is （） of exhaust gases by blowing in fresh air.
the suction。the compression。the removal。the deliver。
问题：
[单选] "Scavenging" on a diesel engine means （）.
injecting fuel oil into a cylinder。removing exhaust gases from the cylinder。forcing air into the cylinders under pressure after the exhaust valve has dosed。a combination of all the above。
问题：
[单选] Sea water is not directly used as a coolant for engines because of its （）.
low specific heat。corrosive action。high expense。acid property。
问题：
[单选] Sediment collects in a tubular purifier （）.
on top cover。on sides of bowl。in drain line on the discs。on the disc。
问题：
[单选] Shims of different thicknesses are inserted between the shells to enable adjustment of （）.
the bearing clearances。the bearing thickness。the bearing strength。the bridge hardne。
问题：
[单选] Since the burning or combustion takes place within the engine itself, the engine is known as （）.
a fire -tube boiler。an internal combustion engine。an external combustion engine。an internal combustion generator。
