中国大学MOOC: 可以将例4.1中的两条语句：area=sqrt(p*(p-edge1)*(p-edge2)*(p-edge3));printf("area=%lf\n",area);合并为一条语句：printf("area=%lf\n",sqrt(p*(p-edge1)*(p-edge2)*(p-edge3)));同时删除area变量的定义。

Design a digital low-pass filter with a passband edge frequency of 1kHz, a stopband edge frequency of 1.5kHz and a sampling frequency of 8kHz. What are the corresponding normalized edge frequencies ωp and ωs? A: ωp=0.25π，ωs=0.375π B: ωp=0.125π，ωs=0.1875π C: ωp=0.25， ωs=0.375 D: ωp=0.125， ωs=0.1875

According to the distribution of oil, gas and water, the water at the edge of containing edge is called (). A: External water B: Bottom water C: Edge water D: Edge bottom water

二进制数字基带传输系统的误码率()。 A: P（1）+P（0） B: P（1）P（0|1）+P（0）P（1|0） C: P（0|1）+P（1|0） D: P（1）P（1|0）+P（0）P（0|1）

二进制基带传输系统的总误码率表示为（ ）。 A: Pe=P(0)P(0/1)+P(0)P(1/0) B: Pe=P(1)P(0/1)+P(0)P(1/0) C: Pe=P(1)P(0/1)-P(1)P(1/0) D: Pe=P(1)P(0/1)-P(0)P(1/0)

1 Match the pictures with the words below. ► towards 3 over __ the rear __ beside __ beneath __ onto __ the edge __ among __70cb721fb229fa771ccc43aca26e97de.png

二进制数字基带传输信系统的误码率计算公式为 A: Pe=P(1)+P(0) B: Pe=P(1)P(0/1)+P(0)P(1/0) C: Pe=P(0/1)+P(1/0) D: Pe=P(0)P(0/1)+P(1)P(1/0)

<p>供热系数ζ可以是</p> A: <p>大于1</p> B: <p>小于1</p> C: <p>等于1</p> D: <p>不可能大于1</p>

电子组态1s2p所构成的原子态为（ ）。 A: 1s2p1S0，1s2p1P1, 1s2p3S1 1s2p3P2,1,0 B: 1s2p1S0，1s2p1P1 C: 1s2p1S0，1s2p3S1 D: 1s2p1P1，1s2p3P2,1,0

Cutting edge inclination angle is the angle included between major cutting edge and________. A: cutting edge plane B: reference plane C: major motion direction D: feed direction