某容器内的压力为1MPa,为了测量它,应选用量程为()的工业压力表.
A.0~1MPa
B.0~1.6MPa
C.0~4.0MPa
D.1~2MPa
参考答案:B
—When did your daughter go to sleep last night?
—She didn’t go to bed ______ she finished her homework.
A.before
B.after
C.until
D.then
已知f’(x)=arctan(x-1)2,且f(0)=0,求。