设L 为圆周：[img=100x26]18030b00a648b8d.png[/img], 则 [img=122x48]18030b00ae0988b.png[/img]
A: R
B: [img=33x19]18030b00b667b18.png[/img]
C: 0
D: [img=31x22]18030b00be6c85f.png[/img]
A: R
B: [img=33x19]18030b00b667b18.png[/img]
C: 0
D: [img=31x22]18030b00be6c85f.png[/img]
举一反三
- 设L 为圆周：[img=100x26]17de8224cd33a51.png[/img], 则 [img=122x48]17de8224d92d03d.png[/img] 未知类型：{'options': ['R', '', '0', ''], 'type': 102}
- 设L沿圆周[img=100x26]1803d35b018a3e1.png[/img]由点（R,0）到点（0,R）, 计算[img=160x48]1803d35b0d8694d.png[/img] A: 0 B: [img=42x43]1803d35b1608d1d.png[/img] C: [img=31x22]1803d35b1e6b381.png[/img] D: [img=40x22]1803d35b26ee8fe.png[/img]
- 设随机变量X的概率密度为f(x)，则f(x)一定满足( ). A: 0≤f(x)≤1 B: [img=183x53]1803b451bb3373a.png[/img] C: [img=133x51]1803b451c807078.png[/img] D: f(+∞)=1
- 设 f(0) = 0, 则 f(x) 在 x = 0 可导的充要条件 A: [img=211x45]180352c8e427c27.png[/img] B: [img=185x47]180352c8ef2c397.png[/img] C: [img=211x44]180352c8f99bd1b.png[/img] D: [img=234x46]180352c9043f635.png[/img]
- 设正态分布N(0, 4)的分布函数为F(x)，则F’(x) = ( ). A: [img=73x63]1802f2c47707b95.png[/img] B: [img=86x65]1802f2c47feb07a.png[/img] C: [img=75x58]1802f2c4884644b.png[/img] D: [img=87x58]1802f2c48fffbbf.png[/img]