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【单选题】
根据税收征收管理法律制度的规定，已开具的发票存根联、发票登记簿应当保存 ( )。A.
3年
B.
5年
C.
10年
D.
20年
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举一反三
【单选题】A burner responsible for producing black smoke in an automatic auxiliary boiler, would be caused by a _________.
A.
defective solenoid valve
B.
dirty fuel nozzle
C.
grounded high tension lead
D.
faulty ignition cable connector
【单选题】A diesel engine experiences a sudden loss in speed, accompanied by black exhaust smoke, with the fuel rack at maximum, and speed remaining below normal .the probable ___.
A.
engine overload
B.
leaky valves
C.
stuck or broken piston rings
D.
low air injection pressure
【单选题】In a diesel engine, late fuel injection is indicated by black or gray exhaust smoke with ______.
A.
low firing pressure
B.
low exhaust temperature
C.
mechanical knock in each cylinder
D.
fuel knock in each cylinder
【单选题】High exhaust temperature and black smoke exhausting from an auxiliary diesel engine can be caused by _____.
A.
engine overload
B.
low combustion temperature
C.
plugged fuel nozzle holes
D.
excessive compression pressure
【单选题】When an auxiliary boiler is panting and emitting black smoke, you should _____.
A.
increase the fuel oil temperature
B.
decrease the fuel oil temperature
C.
decrease the fuel oil supply pressure
D.
increase the air supply
【单选题】Smog is something combined by smoke and fog. London is always known for its 'black fogs'. In the winter of 1952, a milky white fog rolled into the city. It soon turned into black smog as the smoke of ...
A.
smoke and fumes
B.
snow
C.
water drops
D.
fog
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