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问题 问答题

骑自行车上坡前往往要加紧蹬几下，加大速度，从能量转化的角度来说明这样做的好处．

答案

答：骑自行车上坡前，往往要用力加紧蹬几下，这样可以增加自行车的速度，车的动能就会增加，上坡时就会有更多的动能转化为重力势能，这样自行车就会爬得更高．

单项选择题

Representations of software architecture are an enabler for communication between all parties (stakeholders) interested in the development of a computer-based system. An architectural style defines as a family of suchsystems in terms of a ______ of structural organization. More specifically, each ______ describes a systemcategory that encompasses: (1) a set of components (e.g., a database, computational modules) that perform afunction required by a system, (2) a set of ______ that enable "communication, coordination andcooperation" among components, (3)______ that define how components can be integrated to form thesystem, and (4) semantic models that enable a designer to understand the overall properties of a system byanalyzing the known ______ of its constituent parts.

A. function B. data flow C. pattern D. position level
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多项选择题

不适宜指指叩击法的部位是（）。

A.额部

B.胸部

C.四肢

D.肋间

E.背部
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