某工程项目为无节奏流水,A过程的各段流水节拍分别为3d,5d,7d,5d,B过程的各段流水节拍分别为2d、4d、5d、3d。则Ka-b为( )天。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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