题目内容

风速超过（）m／s时，履带式桩机应停止作业。

A. 25
B. 20
C. 15
D. 10

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Stream ciphers run on which of the following？（）

A. Fixed-length groups of digits called blocks
B. Individual blocks，one at a time，with the transformations varying during the encryption
C. Individual digits，one at a time，with the transformations varying during the encryption
D. Fixed-length groups of bits called block

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