【单选题】在单向间歇运动机构中,棘轮机构常用于( )的场合。
【简答题】I was given three books on cooking, the first _______ I really enjoyed. A. of that B. of which C. that D. which
【多选题】按照创业者创业目标的不同,可将创业者分为( )
【单选题】The ______ sections need retelling.
【单选题】在单向间歇运动机构中,棘轮机构常用于 ( ) 的场合。