单选

The single acting cylinder is the simplest form. where pressure is applied to the full area of the piston head to move the load through piston rod extensionThe load causes rod _____ when the drive pressure is released.

A.contraction
B.retraction
C.expansion
D.shrinkage

试题出自试卷《轮机部三管轮考试模拟题2(轮机英语)》

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