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问题 单项选择题

在含有Ca2+、Mg2+的混合液中，混有少量Fe3+，用EDTA法测定Ca2+、Mg2+含量时，要消除Fe3+的干扰，最有效、最可靠的方法是（）。

A.加入掩蔽挤

B.加入还原剂

C.沉淀分离法

D.离子交换法

E.萃取分离法

答案

参考答案：C

多项选择题

预算管理职权是指法律规定的()对预算管理的职责和权限。

A．中央

B．地方政府

C．国家行政机关

D．国家权力机关

E．财政部
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单项选择题

WLANs are increasingly popular because they enable cost-effective connections among people，applications and data that were not possible，or not cost-effective, in the past. For example, WLAN-based applications can enable fine-grained management of supply and distribution （66） to improve their efficienty and reduce （67） . WLANs can also enable entirely new business processes．To cite but one example, hospitals are using WLAN-enabled point-of-care applications to reduce errors and improve overall （68）care．WLAN management solutions provide a variety of other benefits that can be substantial but difficult to measure. For example, they can protect corporate data by preventing（69）through rogue access points. They help control salary costs, by allowing IT staffs to manage larger networks without adding staff. And they can improve overall network mananement by integrating with customers’ existing systems, such as OpenView and UniCenter. Fortunately, it isn’t necessary to measure these benefits to justify investing in WLAN management solutions，which can quickly pav for themselves simolv by minimizinu time-consunlina（70）and administrative chores.

A．personnel

B．expenses

C．overhead

D．hardware
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