The government switched one county at a time within states favors researchers because______.
A. it reduced cash payment in Missouri
B. it offered a randomly controlled environment
C. it helped to extend electronic transfers to the state
D. it saw a concurrent decline in crimes
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建筑企业计划管理包含编制、()、检查及总结分析评价四个环节。
机械设备管理从管理性质上可划分为：机械设备的资产管理，()和技术管理。
建筑企业的工程成本计划主要由技术组织措施计划表、()计划表和降低成本计划表组成。
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