男，35岁。外伤后致双下肢瘫痪。查体：双上肢肌张力和肌力正常，双下肢肌力2级，双侧膝

木材中的（）是指已经除去根、梢、枝、叉的木料，并按一定尺寸加工成规定直径和长度的材料。

A、原条

B、原木

C、锯材

D、枕木

PowerPoint中不能自动播放幻灯片.

Object-oriented analysis (OOA) is a semiformal specification technique for the object-oriented paradigm. Object-oriented analysis consists of three steps. The first step is (71) . It determines how the various results are computed by the product and presents this information in the form of a (72) . and associated scenarios. The second is (73) , which determines the classes and their attributes; Then determine the interrelationships and interaction among the classes. The last step is (74) , which determines the actions performed by or to each class or subclass and presents this information in the form of (75) .

A. use-case modeling B. class modeling
C. dynamic modeling D. behavioral modeling

多跨静定梁的基本*部分是指本身就能独立地承受荷载并能维持（）的部分。

A.不变

B.平衡

C.变动

D.超静定

双联滑轮组是由两个倍率相同的单滑轮组（）而成的，绳索两端都固定在带有左右螺旋槽的卷筒上。