井下毫秒电雷管的段数可根据脚线颜色判断,红、绿脚线是()。 ["3段","4段","5段"]
绞车操作工在()等特殊情况下,必须与信号把钩工提前联系明确信号。 ["运输大件","井巷检修","处理事故","运送火药"]
通风空调系统综合效能试验记录(送、回风口空气状态参数的测定),需对送风口、回风口的()参数进行测定。 ["风量","风速","温度","湿度","风压"]
扫频仪相对于路测终端的优势是() ["灵敏度更高","可测试CSFB","不受邻区配置限制","可测试下行速率"]
南宋正式定都于杭州距今已有()多年。 ["850","860","870","880"]
素有"燕赵植物宝库"之称是哪个风景名胜区?其景观大致概括为什么?