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【简答题】
触电者衣服被电弧光引燃时，应迅速扑灭其身上的火源，着火者切忌________，方法可利用衣服、被子、湿毛巾等扑火，必要时可就地躺下翻滚，使火扑灭。
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【简答题】如图所示系统中溢流阀的调整压力分别为 试求当系统外负载为无穷大时，泵的出口压力为多少？如将溢流阀B的遥控口堵住，泵的出口压力为多少？
【简答题】如图所示系统中溢流阀的调整压力分别为pA=3MPa,pB=1.4MPa,pC=2MPa。试求当系统外负载为无穷大时,泵的出口压力为多少?如将溢流阀B的遥控口堵住,泵的出口压力为多少?
【简答题】When a rare disease ALD ( 肾上腺脑白质营养不良 ) threatened ( 威胁 ) to kill the four-year-old boy Lorenzo, his parents refused to give up hope. Doctors explained that there was no cure for ALD, and that he would...
【单选题】如图,系统中溢流阀的调整压力分别为PA=4MPa, PB=3MPa, PC=2MPa, 当系统外负载为无穷大时,液压泵的出口压力为( ) MPa。
A.
4
B.
3
C.
2
D.
1
【单选题】若人眼的瞳孔直径为 D ,光在空气中的波长为 λ,人眼玻璃状液的折射率为 n ,则人眼的最小分辨角为
A.
0.61 λ /D
B.
1.22 λ /D
C.
1.22 λ /nD
D.
1.22n λ /D
【简答题】如图所示,两系统中溢流阀的调整压力分别为 p A =4MPa, p B =3MPa, p C =2MPa 。 当系统外负载为无穷大时,泵的出口压力各为多少?对图a的系统,请说明溢流量是如何分配的?
【简答题】When a rare disease ALD threatened to kill the four-year-old boy Lorenzo, his parents refused to give up hope. Doctors explained that there was no cure for ALD, and that he would probably die within t...
【简答题】如图所示系统中,溢流阀的调整压力分别为PA=3MPa,pB=2MPa,pC=4MPa。问当外负载趋于无限大时,该系统的压力p为 MPa.
【单选题】(2013·东北三校一模)________ his career as an actor he never gave up his hope of becoming a Hollywood star.
A.
Throughout
B.
Within
C.
For
D.
In
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