超硬材料复合电镀

阅读理解，根据短文内容,补全下列句子。

    When you are in England, you must be very careful in the streets because the traffic  goes on the left.

Before you cross the street, you must look to the right first and then the left.   If the traffic  lights are red,

the traffic must stop.Then the people on foot can cross the road.   If the lights are green,  the traffic cango

and people on foot mustn't cross.  

      In the morning and in the evening when people go to or come back from work,  the streets are very

busy.The traffic is the most dangerous then.    When you go by bus in England, you have to be  careful,

too. You must always remember the traff'ic moves on the left, so you must be careful. Have a look first

or you'll go the wrong way.    In many English cities, there are  big buses with two floors. You can sit on

the second floor. From there you can see the city very well. That'll be very interesting.

1. Before you cross a street in London, you must look to        .

2. When you drive a car in England, you  must            

3. If the traffic lights are green, the traffic _          .

4. Some buses have two floors, so you can sit on the       .

甘露醇的药理作用特点是（）

A.增加血浆渗透压

B.减少肾小球滤过率

C.加强肾小管重吸

D.扩张脑血管

E.收缩肾血管

心动周期中血液充盈主要是由于（）

A.骨骼肌的挤压作用加速静脉回流

B.呼吸运动产生的抽吸作用

C.心室舒张的抽吸作用

D.心房收缩的挤压作用

E.胸内负压促进静脉回流

简述采用高效液相色谱法或气相色谱法建立中药制剂有效成分含量测定方法时系统适用性试验的各项参数及具体指标。

会计软件必须具备系统初始化的基本功能，系统初始化是用来完成将专用会计软件转化为适合本单位实际情况的通用会计软件。( )