机床报警LaserH-Voltage not ready是（）

A . 数据 B . 系统 C . 电池 D . 电源

A . 刀具参数错误 B . 转速设置错误 C . 工件坐标系错误 D . 程序坐标值错误

A . 机床没回参考点 B . 激光器没上高压 C . 没开切割气体空气或氧气

A . 关闭数控系统电源 B . 按下急停按钮 C . 手动反向运动该轴 D . 切掉该轴限位开关电源

A . 液压油不足 B . 砂轮停止 C . 冷却液不足 D . 静压油不足

A . 正确 B . 错误

A . A.报警 B . B.控制 C . C.加工 D . D.定位

A . 液压未开 B . 静压未开 C . 冷却液缺少 D . 砂轮未开

A . 高于 B . 等于 C . 低于 D . 高于等于

A . 随机性故障 B . 无报警故障 C . 可恢复性故障 D . 机械故障

A . RESET B . AUX C . ON D . OFF

A . 正确 B . 错误

A . 串接在行程开关的空气开关脱扣 B . 接触器、继电器故障，PLC急停信号不能复位 C . 复位按钮故障，PLC急停信号不能复位 D . 编码器故障，检测不到零点脉冲信号 E . 行程开关故障

A . 伺服系统故障 B . 数控系统故障 C . PLC故障 D . 程序错误

A . 油气压力不正常 B . 机床变频器故障 C . 机床电机故障 D . 冷却液不足

A . 机床没回参考点 B . 激光器没上高压 C . 没开切割气体空气或氧气

A.he had read B.he read C.he did read D.did he read

The theatre did not burn down. Firefighters arrived quickly after the alarm(报警) and put out the fire so fast that no more than the seat coverings were burned. However, 602 people died, and many more were injured. Panic(惊慌), not the fire itself, caused the tragedy(悲剧). A similar disaster occurred on a July morning in 1990 in the city of Mecca. Thousands of people were walking through a 600-yard-long tunnel(隧道) when the lights accidentally went out. Panic started the frightened people pushing their way through the tunnel and 1,426 people were killed. The people in the Theatre and the Mecca tunnel behaved as people often do when faced with unexpected and dangerous situations such as fires, earthquakes, and floods: they panicked. Panic is one of the more extreme types of grouped people's behavior. It is a useless response to a serious threat or danger. It generally involves flight, but it is a special kind of flight. However, in panic behavior, the flight is unwise and unhelpful. It follows a loss of self-control, and it increases, rather than reduces, danger to oneself and others. Worst Killer in Time of Danger The number of people died in the theatre fire:【46】 The main cause of the deaths in the fire: People's【47】not the fire itself The length of the tunnel mentioned:【48】 Result of flight in time of danger: 1)【49】of self-control 2) increase of【50】

是 否

是 否