电动机和减速器要保持清洁，不得有浮煤、矸石等杂物。
参考答案：对
民用爆炸物品从业单位治安防范技术监控重点部位和探测监控设备所在部位可以不纳入治安检查工作中的现场具体部位。
As middle school students, we _____ the police to keep order.
A．are used to help
B．used to helping
C．used to help
D．used to be helped
