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动脉粥样硬化(核心)
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【简答题】如果一种商品价格上升10%,另一种商品需求量增加了15%,这两种商品的需求交叉弹性是多少?这两种商品是什么关系?
【单选题】The fuel injection pumps on a diesel engine are controlled by a linkage system attached to the _____.
A.
camshaft
B.
crankshaft
C.
governor
D.
flywheel
【单选题】The amount of fuel injection into a diesel engine cylinder by a unit injector, is controlled by___________.
A.
the firing pressure in the cylinder
B.
a metering helix inside the pump
C.
varying the physical length of the plunger stroke
D.
varying the clearance between the injector cam and the injector rocker arm
【单选题】If the diesel engine fuel injection timing is changed to delay the start of injection until the pistons are at top dead center, the engine will_________.
A.
backfire through the air intakes
B.
develop less power under load
C.
have high firing pressures
D.
lift its cylinder relief valves
【单选题】企业应当以实际发生的交易或者事项为依据进行确认、计量和报告,如实反映符合确认和计量要求的各项会计要素及其他相关信息,保证会计信息真实可靠、内容完整,体现的是会计信息质量要求的( )。
A.
可靠性
B.
相关性
C.
可理解性
D.
可比性
【单选题】The two basic types of fuel injection pumps used in the diesel engine are ______ and in-line type.
A.
out-line type
B.
low-pressure pipe
C.
Distributor Pump Assembly
D.
fuel filter
【单选题】Significant retardation of a diesel engine fuel injection timing will result in ________.
A.
smoother engine operation
B.
advanced fuel ignition
C.
increased fuel economy
D.
reduced engine power
【单选题】Turbulence is created in the cylinders of a diesel engine to ________.
A.
obtain injection lag
B.
help mix fuel and air
C.
increase combustion pressure
D.
utilize higher injection pressures
【单选题】Injection lag in a diesel engine may be caused by_______.
A.
a higher cetane number of fuel oil
B.
the diesel fuel used having a high viscosity
C.
mechanical rigidity in the lube pump mechanism
D.
a decrease rigidity in the fuel pump delivery pressure
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