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【单选题】
Which of the following statements is/are true regarding hydraulic pumps in general?A.
Variable volumes can be obtained with gear pumps only by variation of the pump drive speed.
B.
A radial piston pump houses sliding pistons in a stationary cylinder block through which passes a rotating pintle or ported shaft.
C.
The amount of fluid displaced per revolution of an axial piston rotary pump is dependent on the angle formed between the cylinder block and valve plate.
D.
All of the other alternatives
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【简答题】由于定位基准的误差或定位支承点的误差而造成的定位基准位移，这种因定位基准位移而引进的定位误差称为 [填空(1)] prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace>A. 基准位移误差
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【单选题】如图所示零件,底面3和侧面4已加工好,现需加工台阶面1和顶面2,定位方案见图b,c。图c的基准位移误差为:
A.
0
B.
ΔA
C.
ΔH
D.
2ΔA
E.
2ΔH
F.
ΔA+ ΔH
【单选题】如图垫圈零件以内孔在定位销上定位,钻φ 1 mm孔,被加工孔的位置尺寸L 1 ±0.01mm的定位误差中基准位移误差是:
A.
0.021mm
B.
0.013mm
C.
0.007mm
D.
0.041mm
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