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【单选题】
(2008年)已知矩阵 则A的秩r(A)等于( )。A.
0
B.
1
C.
2
D.
3
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反馈参考答案：
举一反三
【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
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