粗粒溜槽，物料粒度可达100~200毫米均采用（）作业。
A、间断
B、循环
C、连续
D、精选
参考答案：A
______ by his grandparents in the countryside, he isn’t used to _______ in the city.
A．Having brought up, live
B．Grown up, living
C．Growing up, live
D．Brought up, living
某轻弹簧竖直悬挂于天花板上，当挂一个0.5N的钩码时，它伸长了2 cm；再挂一个0.5N的钩码，它的总长为18 cm，则弹簧的原长为 cm，劲度系数为 N/m (g="10" N/kg)
