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【单选题】
数控车床液压系统中的（）是靠密封工作腔容积变化变化进行工作的。
A.
液压缸
B.
溢流阀
C.
换向阀
D.
液压泵
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sweet potatoes, corns, yams, potatoes and pumpkins;
B.
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C.
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相关题目：
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B.
Civilian aircraft are free to move over all territories.
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Cargo carders no longer collide with one another.
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D.
Jǔshǒu ‘raises to hand’.
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【单选题】One of the well-accepted version of Wu Gu or Five Grains is:
A.
sweet potatoes, corns, yams, potatoes and pumpkins;
B.
millet, broomcorn millet, rice, wheat and soybean;
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corn, millet, broomcorn millet, rice and wheat;
D.
hemp, rice, millet, broomcorn millet and wheat.
查看完整题目与答案