單項(xiàng)選擇題曲線(xiàn)y=sinx(0≤x≤π/2)與直線(xiàn)x=π/2,y=0圍成一個(gè)平面圖形。此平面圖形繞x軸旋轉(zhuǎn)產(chǎn)生的旋轉(zhuǎn)體的體積是:()

A.π2/4
B.π/2
C.π2/4+1
D.π/2+1


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3.單項(xiàng)選擇題

由曲線(xiàn)y=ex,y=e-2x及直線(xiàn)x=-1所圍成圖形的面積是:()

A.(1/2)e2+1/e-1/2
B.(1/2)e2+1/e-3/2
C.-e2+1/e
D.e2+1/e

5.單項(xiàng)選擇題

已知,則a的值是:()

A.1
B.-1
C.1/2
D.0

6.單項(xiàng)選擇題

廣義積分,則計(jì)算后是下列中哪個(gè)結(jié)果()?

A.I=1
B.I=-1
C.I=1/2
D.此廣義積分發(fā)散

7.單項(xiàng)選擇題

廣義積分的值是:()

A.1
B.-1
C.1/2
D.廣義積分發(fā)散

8.單項(xiàng)選擇題

廣義積分等于:()

A.收斂于(2/3)ln2
B.收斂于(3/2)ln2
C.收斂于(1/3)ln(1/4)
D.發(fā)散

10.單項(xiàng)選擇題

令x=2cost,則等于:()

A.-16sin2t·cos2tdt
B.-16sin2t·cos2tdt
C.16sin2t·cos2tdt
D.16sin2t·cos2tdt