若在区间 ( a , b ) 内,函数 f ( x ) 的一阶导数 f ′ ( x ) < 0 ,导数 f ′′ ( x ) > 0 ,则 f ( x ) 在该区间有( )
A.
单调减少,曲线上凹
B.
单调减少,曲线上凸
C.
单调增加,曲线上凹
D.
单调增加,曲线上凸
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【单选题】The car industry suffered another setback yesterday when Lucas Electrical Company announced that many of its 12,000 workers at 15 factories in the West Midlands would be going on short time. It was ex...
A.
the announcement of production cuts by the Austin-Rover
B.
the report of the sluggish market for the car industry
【单选题】The car industry suffered another setback yesterday when Lucas Electrical Company announced that many of its 12,000 workers at 15 factories in the West Midlands would be going on short time. It was ex...
A.
the announcement of production cuts by the Austin-Rover
B.
the report of the sluggish market for the car industry