中药中有效成分最常用的提取方法是溶剂提取法。

Any car accident is frightening, but an accident in which your vehicle is thrown into the water, with you trapped inside, is absolutely terrifying.   小题1:  However, most deaths result from panic, without a plan or understanding what is happening to the car in the water. By adopting a brace(支撑) position, acting decisively and getting out fast, you can save yourself from a sinking vehicle.

Brace yourself for impact (撞击力). As soon as you're aware that you're going off the road and into a body of water, adopt a brace position. The impact could set off the airbag system in your vehicle, so you should place both hands on the steering wheel in the "ten and two" position.

Undo your seatbelt.   小题2:  Unbuckle the children, starting with the oldest first. Forget the cell phone call. Your car isn't going to wait for you to make the call.

  小题3:  Leave the door alone at this stage and concentrate on the window. A car's electrical system should work for up to three minutes in water, so try the method of opening it electronically first. Many people don't think about the window as an escape option either because of panic or misinformation about doors and sinking.

Break the window. If you aren't able to open the window, or it only opens halfway, you'll need to break it with an object or your foot. It may feel counter-intuitive (有悖常理的) to let water into the car.   小题4:

Escape when the car has equalized. If it has reached the dramatic stage where the car cabin has been filled with water and it has become balanced, you must move quickly and effectively to ensure your survival.   小题5:  While there is still air in the car, take slow, deep breaths and focus on what you're doing.

A．Open the window as soon as you hit the water.

B．Surviving a sinking car is not as difficult as you think.

C．It takes 60 to 120 seconds for a car to fill up with water usually.

D．Such accidents are particularly dangerous to the risk of drowning.E.In conclusion, if you know what to do in the water, you will be safe.

F.This is the first thing to attend to, yet it often gets forgotten in the panic.

G.But the sooner the window is open, the sooner you can escape directly through it.

在中国境内，地势最高的是青藏高原，号称（ ）

A．“世界高原”

B．“世界屋脊”

C．“高原世界”

D．“屋脊世界”

患者，女性，40岁，外伤所致左侧胫腓骨骨折，复位后给予小腿管型石膏外固定，患者主诉石膏内有持续性局部疼痛。

处理石膏压疮的主要方法是

A．向石膏内塞衬垫

B．拆除更换石膏

C．在石膏表面做好标记

D．修整石膏边缘

E．抬高患肢以利消肿

在真空中，可见光的波长范围是：（）

A.400～760nm

B.400～760mm

C.400～760cm

D.400～760m

下列哪些选项属于初次或换证检验中对推进机器遥控系统的检验内容？（）

A、对设在驾驶室的主机紧急停车装置进行效用试验或模拟试验

B、关闭所有自动或遥控系统，检查主机就地进行控制的可靠性

C、检查螺旋桨转速、转向指示器及可变螺距螺旋桨螺距指示器的准确性

D、对可遥控连续启动的主机，进行模拟3次启动失败，检查自动停止和报警装置工作是否正常