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【简答题】
如图，抛物线y=ax 2 -5ax+4经过△ABC的三个顶点，已知BC ∥ x轴，点A在x轴上，点C在y轴上，且AC=BC． （1）求抛物线的对称轴； （2）写出A，B，C三点的坐标并求抛物线的解析式； （3）探究：若点P是抛物线对称轴上且在x轴下方的动点，是否存在△PAB是等腰三角形？若存在，求出所有符合条件的点P坐标；不存在，请说明理由．
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【单选题】如图所示,1、2、3点位于同一水平面上,其压强关系为:
A.
1>2>3
B.
1=2=3
【单选题】Which of the routine maintenance procedure listed is required for starting air receivers?
A.
Frequent draining of accumulated moisture
B.
Frequent testing of relief valves
C.
A close watch on temperature to prevent fluctuations in pressure
D.
Frequent cleaning to re move oil and foreign matter
【单选题】Routine Maintenance means( ).
A.
to complete the task called for on the work order
B.
to inspect the equipment, prevent small problems before they become larger ones
C.
to save energy
D.
to manage waste
【简答题】Here is a list of routine maintenance you should be performing on your computer each and every month. If you use your computer on a daily basis or surf the net everyday, you should perform. this maint...
【单选题】Which of the routine maintenance procedures listed is required for starting air receivers?
A.
over-speeding
B.
overload
C.
low exhaust temperature
D.
high crankcase pressure
【单选题】Routine maintenance on a Central Control Room hermetically sealed air conditioning unit should include _________.
A.
changing the air filter
B.
recharging the system
C.
changing compressor lubricant
D.
renewing container vacuum
【单选题】Which of the following actions should be taken if during a routine maintenance inspection of a centrifugal pump, localized scoring on a pump shaft sleeve is detected? .
A.
Correct the cause of the scoring and repair the sleeve or replace with a new one
B.
Reassemble the unit and provide more water leak off for proper lubrication
C.
Check for parallel alignment of the sleeve radial faces to the sleeve bores
D.
Reassemble the unit and adjust the governor to obtain a slower speed
相关题目：
【单选题】如图所示,1、2、3点位于同一水平面上,其压强关系为:
A.
1>2>3
B.
1=2=3