从微分学角度来讲,圆的面积可以被理解为()的面积和。
A、三角形
B、扇形
C、长方形
D、不规则几何图形
参考答案:C
陶瓷过滤机的分配头部件由()组成。
A、分配头组件
B、弹簧
C、摩擦片组件
D、冲洗水管
______in the strength of the carrier signal is varied to represent binary 1 or 0.______is a system that can map a name to an address and conversely an address to an name.______is a three-way handshaking authentication protocol that it’s packets are encapsulated in the point-to-point protocol______is an approach that enables an ATM Switch to behave like a LAN switch.()is an guided media which is made of glass or plastic and transmits signals in the form of light.
A.Coaxial cable
B.Optical fiber
C.Unshielded Twisted-pair Cable
D.Shielded Twisted-pair Cable