血液透析常见并发症（）
A.心衰
B.低血压
C.出血
D.腹痛
E.感染
参考答案：A, B, C, E
As we know that the rocket ____ sending satellites or spaceships into space. [ ]
A. is used to
B. is used for
C. uses for
二进制数110101对应的十进制数是
A．44
B．65
C．53
D．74
