如何防止皮带伤人事故的发生？
参考答案：
转动部位必须加装护栏及警示牌、皮带运行时禁止清理滚筒煤泥，皮带沿线每隔一定的距离安装过桥。
Not only ____interested in a football but ____beginning to care about it.
A．the father is ,his family are
B．.the father is , ishis family
C．is the father ,his family are
D．is the father is ,his family is
汽车以10m/s的速度匀速行驶，行驶18km所用的时间是 h。
