机房内禁止放置易燃物品，禁止吸烟。

B The Ancient Olympic Games古代奥林匹克运动会
According to historical records，the first (1) Olympic Games can be traced back to 776 BC.They (2) dedicated to the Olympian gods and were staged on the (3) plains of Olympia.They continued for nearly 12 centuries， (4) Emperor Theodosius decreed in 393 A.D.that aU such"pagan cults" (5) banned.
The oldest myth which concerns the beginning of the (6) Games is that of Idaios Daktylos Herakles.According to other (7) ，Zeus，the father of humanity，fought and defeated Cronus in a (8) for the throne of the gods.Finally，the well-known (9) Herakles is mentioned who staged games in Olympia in honour (10) Zeus,because the latter had helped him conquer Elis when (11) went to war against Augeas.
Through the 12 centuries of (12) Olympic Games，many wonderful athletes competed in the stadium and (13) hippodrome of ancient Olympia’s sacred area，moving the crowds with (14) great achievements.Although mortal，their Olympic victories immortalised them.Of (15) best athletes who left their mark on the sacred vallev (16) Olympia，some surpassed all limits and became legends by winning (17) successive Olympic Games and remaining at the forefront of their (18) for more than a decade.
The ancient Olympic Games were (19) a one.day event until 684 BC.when they were extended (20) three days.In the 5th century B.C.，the Games were extended again to cover five days.

急性心肌梗死时缓解疼痛宜用

A.休息和吸氧 

B.硝酸甘油 

C.消心痛 

D.吗啡 

E.以上都不是

进入实验室后，要注意的事情是（）（1）在实验室记录本上登记实验室使用时间和实验内容（2）离开前清理实验室（3）做好实验记录，在电脑上的实验数据应该及时备份带走（4）当实验室无其他人的时候关闭实验室的水电及门窗（5）预习与实验有关的教科书内容

A．（1），（2），（3）（5）

B．（1），（2），（3）（4）

C．（1），（3），（4）（5）

D．（1），（2），（4）（5）

百度站内搜索项目不可以设置哪些功能（）

A、搜索提示

B、关键词屏蔽

C、相关推荐

D、智能置顶

电流互感器在运行时，二次绕组绝不能开路，否则就会感应出很高的电压，造成人身和设备事故。