【简答题】The relationbetween elements that form part of the same form, sequence, construction, etc.,e.g. between s , p , and r in a form such as spring , or between a subject and averb in construction such as ...
【单选题】国家标准规定,标准渐开线齿轮的分度圆压力角α=
【简答题】P____________, as a verb, refers to maintain sth. in its original or exsiting state or take action to save it or protect if from damage or decay.
【简答题】P________, as a verb, means to be normal or very common in a particular place or time; or refers to proposals, or opinions to be accepted or gain influence, often after a struggle or argument.
【单选题】国家标准规定,标准渐开线齿轮的分度圆压力角α= 度。