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【判断题】
( )在气压驱动中,为气缸输出力稳定,最好保持一定的背压。A.
正确
B.
错误
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【单选题】对膝关节的描述,错误的是
A.
是全身关节中最复杂的关节
B.
有腓侧副韧带加固
C.
由透明软骨构成的半月板，内侧“C”形，外侧“O”形
D.
膝交叉韧带表面有滑膜包被
E.
可作屈伸运动和条件性旋转运动
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