在大功率采煤机中配有破碎机装置，它的用途是破碎（）。
A、大块碎石
B、小块碎石
C、大块煤
D、小块煤
参考答案：C
(2013·高考江苏卷)The president of the World Bank says he has a passion for China，________he remembers starting as early as his childhood.
A．where
B．which
C．what
D．when
当等速凸轮的工作曲线由几段组成且导程数值较小，可采用主轴挂轮加工法加工。
