开放性骨折现场止血宜首选（） A.上止血带 B.局部压迫包扎 C.指压出血血管 D.

在内燃机试验台架上，如何测取内燃机的速度特性曲线

阅读理解。

     My name is Jim Green. I am a student. I'm twelve years old. I'm in Class One, Grade Seven. This is

my father. His name is Jeff Green. He is thirty-eight years old. He's a doctor at a hospital. He can play

basketball, but he can't play football. This is my mother. Her name is Ann Green. She is thirty-six years

old. She is a teacher in a university. She can play the piano well, but she can't play the violin. Kate is my

sister. She is eight years old. She is a student, too. She can sing English songs, but she can't ride a horse.

若多边形的边数增加1，则其内角和的度数（   ）

A．增加180º

B．其内角和为360º

C．其内角和不变

D．其外角和减少

在实践中常用来检出随机误差的是（）.

A.1_2s

B.1_2.5s

C.4_1s

D.1_3s

E.1_1s

质量控制是质量管理的一部分，致力于满足（）。