护士小张，在给患者测体温时不小心将水银体温计摔碎在病房水泥地面上，小张的下列紧急处理措施错误的是（）。

A、将患者转移到室外

B、开窗通风

C、打开室内所有热源，促进汞的快速消散

D、处理地面汞滴时应穿戴防护用品

E、如果有皮肤接触，立即用水冲洗

谷某由于操作不当将丙酮晒在水泥地面上，未采取任何措施就离开了现场，会( )。

A、导致血液窒息

B、导致细胞内窒息

C、导致呼吸系统过敏

D、导致中枢神经抑制

E、刺激皮肤和眼睛

常年使用的钢筋堆放场地（工厂化生产）最好选择有很好排水设施的水泥地面上，铺设距离地面（）cm高的方木或石条上。

A、不低于5

B、不高于15—20

C、不低于20—30

D、不高于10—15

Escaping a fire is a serious matter. Knowing what to do during a fire can save a life. It is important to know the ways you can use and show them to everyone in the family, such as stairways and fire escape, but not elevators. From the lower floors of the building, escape through windows is possible. Learn the best way of leaving by the window with the least chance of serious injury.
The second floor window is usually not very high from the ground. An average person, hanging by the fingertips will have a drop of about six feet to the ground. It is about the height of an average man. Of course, it is safer to jump a short way than to stay in a burning building.
Windows are also useful when you are waiting for help, be sure to keep the door closed before opening the window. Otherwise, smoke and fire may be drawn into the room. Keep your head low at the window to be sure you get fresh air rather than smoke that may have leaked（渗入) into the room.
On a second or a third floor, the best windows for escape are those which open on a roof. From the roof a person can drop to the ground more safely. Dropping onto cement（水泥地) might end in injury. Bushes and grass can help to break a fall.
Which of the following should not be used when trying to escape a fire？
A．windows.
B．elevators.
C．fire escapes.
D．stairways.

从同一高度自由落下的玻璃杯，掉在水泥地上易碎，掉在沙地上不易碎，这是因为（　　）