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【单选题】
More than seven in ten get angry ________ to wait longer than one minute for a web page to be downloaded.A.
if forced
B.
unless forced
C.
once forcing
D.
until forcing
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举一反三
【单选题】Combustion knock occurring in a diesel engine can be caused by _____.
A.
low coolant temperature
B.
insufficient fuel
C.
high ambient temperature
D.
carbon buildup on the injector tips
【单选题】Which of the following precautions must be taken if an electric immersion heater is used to keep the coolant in a diesel engine warm during the time the engine is secured?
A.
the coolant temperature must be maintained at 180℃
B.
the thermostatic bypass valves must be manually opened before the engine is started
C.
the pressure cap must be removed while the
D.
electrical power to the heater must be secure
【单选题】In a closed diesel engine freshwater cooling system, the amount of coolant flowing through the heat exchanger is controlled by the _____.
A.
suction pressure regulator
B.
thermostatic bypass valve
C.
sea water temperature
D.
water level in the expansion tank
【单选题】Which of the following precautions must be taken electric impression heater is used to keep the coolant in a diesel engine during the time the engine is secured?
A.
the coolant temperature must be maintained at 180°c
B.
the thermostatic bypass valves must be manually opened before the engine is started
C.
the pressure cap must be removed while the ??
D.
electrical power to the heater must be secure
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