电梯检修时，运行范围不应（）的行程。。A.超过正常 B.大于正常 C.视情况而定

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。 选项中有两项为多余选项。

The sea has always interested man. From it he can get food, minerals, and treasure.   小题1:   But he could not go far beneath its surface.

  小题2:   However, he is not a fish. He must breathe air, so he can’t stay under the water’s surface for any length of time. To explore deep water, man faces even more dangers and problems.

A diver who wants to stay under water for more than a few minutes must breathe air or a special mixture of gases.   小题3:   He can carry a tank of air on his back and breathe through a nose and a mouthpiece. Water weighs 800 times as much as air. Tons of water pushes against a diver deep in the sea.   小题4:  

When a diver is under great pressure, his blood takes in some of the gases he breathes. As he rises to surface, the water pressure becomes less. If the diver rises too quickly, the gases in his blood form bubbles(气泡). The diver is then suffering from the bends(潜水夫病). The bends can cause a diver to double up in pain.    小题5: 

A．His body is under great pressure.

B．Scientists are trying to find more about the sea.

C．For thousands of years, he could sail on it.

D．They can even kill him.E. He can wear a diving suit and have air pumped to him from above.

F. The water pressure can cause a diver to breathe with difficulty.

G. Man wants to explore deep into the sea.

在下列4个选项中，不属于基本关系运算的是_______。

A．连接

B．投影

C．选择

D．排序

骨髓增生异常综合征国际预后积分系统（IPSS）危险度分型的主要根据是（）

A.骨髓原始细胞百分比

B.染色体核型

C.细胞减少受累的系列多少

D.骨髓各系造血细胞数量

E.有无病态造血

下列关于在PowerPoint中编辑影片的说法，错误的是______。

A．在PowerPoint中播放的影片文件，只能播放完毕后才能停止

B．默认状态下，单击鼠标播放影片，再次单击则停止影片播放

C．插入PowerPoint中的视频文件不会显示图像

D．只有在播放幻灯片时，才能看到影片效果

突发事件要快速反应、属地处置，在发生突发事件后，（）都要在第一时间赶到现场，及时展开先期的应急处置工作。

A.上级部门管理人员

B.监管部门负责人

C.集团公司负责人

D.属地应急救援人员