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保持正常水位的重要意义是什么?

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好氧微生物生长的适宜pH范围是()

A. 4.5-6.5
B. 6.5-8.5
C. 8.5-10.5
D. 10.5-12.5

DOE实验的策略有()、保留胜者、全因子设计。

下列关于基本医疗保险药品目录的说法,错误的是()

A. 目录新药增补工作每年进行一次,各地不得自行进行新药增补
B. 目录中的"甲类目录"和"乙类目录"由国家统一制定,各地不得调整
C. 目录中的"甲类目录"的药品是临床必需,疗效好,同类药品中价格低的药品
D. 目录中的"乙类目录"的药品是可供临床治疗选择,疗效好,同类药品中价格略高的药品

A customer has an EMC Symmetrix DMX-4 installed. The disk subsystem is coming off lease. The customer is considering an IBM System Storage DS8800. What is a key advantage of the DS8800()

A. The DS8800 has a higher disk RPM than the Symmetrix DMX-4
B. The DS8800 has higher capacity with more efficient footprint than the Symmetrix DMX-4
C. The DS8800 supports FlashCopy for internal array replication
D. The DS8800 supports external virtualizatio

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