对于高阻管路,不宜采用离心泵并联操作,原因是什么?
参考答案:
①因为高阻管路特性曲线较陡
②并联操作,流量增加的百分数较小
③运行不经济
阅读理解
Rick is my cousin. He is my aunt's son. He is a music teacher. He gets up early every day. He usually gets up at 5:30 in the morning. After he brushes his teeth, he eats breakfast. After that he plays the guitar. Then at about 7:40 he takes the No. 2 bus to his school.
He has no classes on weekends. He usually goes to the guitar club. There he helps kids learn the
guitar, He can play the guitar very well. Do you want to play the guitar? You can call Rick at 3536338.
( )1. Rick is my aunt' s daughter.
( )2. Rick is an English teacher.
( )3. Rick usually gets up at 5 :30 in the morning.
( )4. Rick takes the No. 2 bus to his school.
( )5. Rick helps kids learn the guitar.
需进行治疗药物监测的抗肿瘤药物是()
A.白消安
B.甲氨蝶呤
C.氮芥
D.盐酸表柔比星(表阿霉素)
E.紫杉醇