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问题 单项选择题

工作的自由时差是指（）。

A．在不影响工期的前提下本工作可以机动的时间

B．本工作与紧后工作的时间间隔

C．本工作与紧前工作的时间间隔

D．紧后工作最早开始时间的最小值与本工作最早完成时间的差值

答案

参考答案：D

选择题

下列各反应属于加成反应的是（　　）

A．CH4+2O2→CO2+2H2O

B．CH2=CH2+Br2→CH2Br-CH2Br

C．CH4+Cl2→CH3Cl+HCl

D．2CH3CH2OH+O2→2CH3CHO+2H2O
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单项选择题

Traditional network layer packet forwarding relies on the information provided by network layer  (1) protocols, or static routing, to make an independent (2) decision at each hop within the network. The forwarding  (3) is based solely on the destination  (4) IP address. All packets for the same destination follow the same path across the network if no other equal-cost paths exist. Whenever a router has two equal-cost  (5) toward a destination, the packets toward the destination might take one or both of them, resulting in

空白（4）处应选择（）

A.anycast

B.multicast

C.broadcast

D.unicast
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