停备厂区生水石灰系统运行后，其循环水控制指标要求：（ ）2.5-3.5，pH值： 8.4-8.8 ，硬度≤17.5 mmol/L。
浓缩倍率
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________, John has been to several foreign countries.
设数列满足 {an} 满足 a1=0 ，an+1 -2a n=1, 则 a 100 = （）
I prefer this diagram ________ that one.
All_____for time off must go through the Human Resources Department first.
She got a job as an assistant stage manager at the Cambridge Arts Festival Theatre, thinkingthat it might ________ to a career as a playwright ( 剧作家 ).
