如果液压系统的外负载、阻力均为零,则液压系统中的压力为()。
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液压传动中,作用在活塞上的推力越大,活塞运动的速度赶快。()
A. 对
B. 错
What would the guest like to take order?
A. Dinner a la carte
B. Dinner table d'hote
Vichyssoise is a soup made of ().
A. leeks
B. onions
C. potatoes
D. cream
What side dish would he like to go with the steak?
A. peas
B. carrots
C. asparagus
D. French fries