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【单选题】
按照蓄电池电解液的性质，蓄电池可分为（）。A.
银锌电池和镍镉电池
B.
酸性电池和碱性电
C.
镍镉电池和镍锌电池
D.
主用和备用
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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】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 with...
【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...
【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
【简答题】图4-11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，液压泵的出口压力各为多少?对图4-11a的系统，请说明溢流量是如何分配的?
【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】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...
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