【简答题】不同硬度物料共同粉碎时,出现选择性粉碎现象的原因。
【简答题】链传动中,当链节距p增大时,优点是______,缺点是______。
【简答题】链传动中,当节距P增大时,优点是(),缺点是()
【单选题】(Let's not) waste time on (matters of no important). We have other (vital) problems to (deal with).
B.
matters of no important
【单选题】(Let's not) waste time on matters (of no important). We have other (vital) problems to (deal with).
【单选题】(Let's) not waste time on (matters of no important). We have other (vital) problems to (deal with).
B.
matters of no important
【单选题】(Let's not) waste lime on (matters of no important). We have other (vital) problems to (deal with).
B.
matters of no important
【单选题】By 'critical times' (para. 2) the author means ______.
A.
important stages in the child's development
B.
difficult periods in the child's life
C.
times when mothers often neglect their children
D.
moments when the child becomes critical towards its mother
【单选题】链传动中,当链节距p增大时,优点是( ),缺点是( )。