∵y=sin23π=32等于常数,∴y′=0,
故答案为0.
急性心包炎的症状,除了()
A.发热
B.呼吸困难
C.心前区痛
D.眩晕
E.干咳
Who is responsible for quality management in the project ?()
A.Project leade
B.Quality control departmen
C.Project manage
D.Team membe