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【单选题】
老年期个性发展表现出不同的趋势,体现完善化、中庸化、以及( ):A.
平民化
B.
多样化
C.
普通化
D.
极端化
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【单选题】Because of the close tolerances used in diesel engine fuel oil pumps, a worn plunger requires___________.
A.
grinding the spare plunger to the barrel
B.
replacing the plunger and the barrel
C.
highly polishing both the plunger and barrel
D.
replacing plunger only
【单选题】Because of the close tolerances used In diesel engine fuel oil pumps,a worn plunger requires ____.
A.
grinding the spare plunger to the barrel
B.
replacing the plunger and the barrel
C.
highly polishing both the plunger and barrel
D.
replacing plunger only
【单选题】When the follower is on the base circle of the cam, the pump plunger is at the _____ of its stroke.
A.
top
B.
middle
C.
bottom
D.
any of the above
【单选题】The amount of fuel delivered by a helical plunger fuel injection pump is controlled by ____.
A.
varying the pump discharge pressure
B.
varying the pump return pressure
C.
rotation of the pump plunger
D.
rotation of the pump barrel
【单选题】Which of the following will of the spiral, on the plunger of a jerk pump, uncovers the spill port?
A.
The plunger immediately reverses direction
B.
The pressure drops and fuel delivery stops
C.
The plunger rotates to the no fuel position
D.
The barrel rotates to the zero effective stroke position
【单选题】当中央银行提高法定存款准备金率时，市场的反应通常是（ ）。
A.
商业银行可用资金增多，贷款下降，导致货币供应量减少
B.
商业银行可用资金减少，贷款上升，导致货币供应量增多
C.
商业银行可用资金减少，贷款下降，导致货币供应量减少
D.
商业银行可用资金增多，贷款上升，导致货币供应量增多
【简答题】For the swashplate plunger pump, the pulsation under the odd plunger number is ( ) than under the even plunger number.
【简答题】有一稳态导热的平壁炉墙,墙厚 240mm ,导热系数 λ = 0.2W/m ∙ K ,若炉墙外壁温度为 45°C ,为测得炉墙内壁温度,在由外壁向墙内 100mm 处插入温度计,测得该处温度 100°C ,试求炉墙内壁温度。
【单选题】As the plunger moves upwards in the barrel, injection will commence once the plunger has _____ the spill ports and the pressure builds up.
A.
opened up
B.
closed off
C.
lined up
D.
taken off
【单选题】When disassembling or assembling an injection pump plunger and barrel you should ___________.
A.
keep the parts immersed in diesel fuel
B.
always keep the plunger and barrel together
C.
work over a linoleum-type surface
D.
all of the above
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