【多选题】Which of the following statements correctly describe the differences between half-duplex and full-duplex Ethernet? (Select two answer choices.)
A.
Full-duplex Ethernet uses CSMA/CD to prevent collisions.
B.
Half-duplex Ethernet uses a loopback circuit to detect collisions.
C.
A full-duplex Ethernet card allows 20Mbps for data transmission.
D.
Full-duplex Ethernet makes use of two pairs of wires for data.
E.
An Ethernet hub can operate both half and full duplex simultaneously.
【单选题】下列描述,错误的是( )
A.
阈值是指能引起组织细胞兴奋所必需的最小刺激强度
【判断题】阈值大小与组织兴奋性的高低呈反变关系,阈值越小,兴奋性越低。
【简答题】哈佛大学的西奥多·莱维特教授强调,在看产品问题上我们不能有“ ”——不能仅从产品的角度来看待,而应该从顾客的问题的角度来认识产品的性质和行业的性质。
【单选题】A writer has to ____ his imagination and experience to produce good works.
【单选题】which of the following industries account for more than half of the gdp in canada?
【简答题】Now, the 22-year-old art design major at Sichuan Fine Art Institute has 1) _________ his dream. His micro-blog works have more than 2) _________ followers, and soon he will 3) _________ his first book...