单选题Flexible hose under pressure in a hydraulic system will （）.Atend to twist about its long axisBexpand in length and in diameterCcontract in length and expand in diameterDflex at right angles to the applied pressure
单选题
Flexible hose under pressure in a hydraulic system will （）.
A
tend to twist about its long axis
B
expand in length and in diameter
C
contract in length and expand in diameter
D
flex at right angles to the applied pressure
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