The government forbids ______ such bad books.
A. published
B. to publish
C. publish
D. publishing
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Charles Babbage is generally considered ______ the first computer.
A. to invent
B. inventing
C. to have invented
D. having mvented
一个楼梯段的踏步数要求最多不超过( )级,最少不少于( )级。
A. 16,2
B. 18,3
C. 20,3
D. 18,2
公共建筑内的每个防火分区,其安全出口的数量不应少于( )个。
A. 2
B. 3
C. 4
D. 5