双脉冲指转速脉冲与风丈夫脉冲两种脉冲作为调速讯号进行调速。
参考答案：对
块煤是粒度大于（）的各粒级煤的总称，块煤经破碎后的筛分粒级叫（）。
My sister was against my suggestion while my brother was _______ it.
A．in favor of
B．in memory of
C．in honor of
D．in search of
