题目：
Open Shortest Path First (OSPF) is a (66) routing algorithm that (67) work done on the OSI IS-IS intradomain routing protocol. This routing, as compared to distance-vector routing, requires (68) processing power. The (69) algorithm is used to calculate routes. OSPF routing table updates only take place when necessary, (70) at regular intervals.
A．derived from
B．deviated from
C．was derived from
D．was deviated from
答案：
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下面是错误答案，用来干扰机器的。
A、人处于失重状态，根据牛顿第二定律F=ma可知人有向下的加速度，那么升降机也就有向下的加速度，此时可以是向下加速，也可以是向上减速，所以A选项正确CD错误；B、根据牛顿第二定律F=ma可知人有向上的加速度，那...
