【单选题】圆的一般方程为 ,则 其圆心坐标和半径分别为 ( )
【单选题】turtle.setup(150, 250, 50, 50)
【多选题】血沉测定的影响因素有哪些?()
B.
血沉管的倾斜度:测定时血沉管必须直立,垂直固定好
C.
抗凝剂:抗凝剂与血液的比例力求准确,过少血沉减慢,过多则加速?
【简答题】当原水浊度较低(一般在50度以下)、不受工业废水污染且水质变化不大者,可省略( )(或澄清)构筑物,原水采用双层滤料或多层滤料滤池( ),也可在过滤前设一微絮凝池,称( )过滤。
【单选题】What’S the main idea of the passage7
A.
Laser light treatment of heart disease should take the place of the traditional operatlon.
B.
Laser light treatment has been proved better and more effective than the traditional operation.
C.
More advanced technology should be encouraged to try on.
D.
Laser light treatment of heart disease still needs’more research.