井控管汇中阀门、三通、四通和五通等主要部件累计更换率达40%应强制判废。（）
参考答案：错
—How did you like Nick’s performance last night ?
—To be honest, his singing didn’t ________to me much.
A．appeal
B．belong
C．refer
D．occur
已知f’（x）=sec2x+sin2x，且f（0）=3/2，则f（x）等于（）．
A.
B.
C.
D.
