细胞分裂素可促进一些双子叶植物如菜豆、萝卜的子叶或叶圆片扩大，这种扩大主要是因为促进了细胞的（）。而生长素只促进细胞的（），赤霉素对子叶的扩大没有显著效应。
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目前认为最有效的根管冲洗剂是（）
A. 生理盐水
B. 2%氯亚明
C. 3%过氧化氢液
D. 30%过氧化氢液
E. 5.25%次氯酸钠液
醌经何作用可形成半醌自由基，发生自氧化（）。
A. NADPH－细胞色素P－450还原酶
B. NADPH－细胞色素P－450氧化酶
C. FDA氧化酶
D. 黄嘌呤氧化酶
E. 醛脱氢酶
A global customer’s IT strategy is based upon two DS8000 systems and an N series gateway. They want to protect their business by implementing a disaster recovery solution. The storage specialist has recommended cascaded mirroring. Which of the following is the business benefit of cascaded replication（）
A. it is cost efficient， as a single N series or DS8000 can have its controllers split between the primary and secondary site and use semi- synchronousmirroring while using asynchronous mirroring to a third site
B. the second site acts as a repeater station so that greater geographical distances can be achieved
C. ITprovides high availability together with disaster recovery by implementing Metro/Global Mirror across three geographically dispersed systems
D. it guarantees data protection by implementing two synchronous copies of the primary site data
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