A reduction in strength is__（）
A. delay distortion
B. attenuation
C. pulsing
D. interlacing
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In a__ network, a dedicated communications path is established between two stations through the nodes of the network. The telephone network is the most common example（）
A. frame relay
B. ATM
C. circuit switching
D. packet switching
In a__ the modules are arranged in a vertical stack. Each layer in the stack performs a related subset of the functions required to communicate with another system（）
A. protocol architecture
B. NSP
C. protocol data unit
D. frame relay
A genetic map shows which of the following（）
A. the linear order of genes on a chromosome
B. the distance in numbers of nucleotides between two genes
C. the number of genes on each of the chromosomes of a species
D. the location of chromosomes in the nucleus when they line up at metaphase during mitosis
E. the location of double crossovers that occur between two genes
Recombination occurs through（）
A. crossing over and independent assortmen
B. crossing over and chromosome interference
C. chromosome interference and independent assortment
D. somatic-cell hybridization and chromosome interference
E. complete linkage and chromosome interference
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