男性，48岁。胃镜检查发现胃小弯侧1.2cm×1.0cm浅表溃疡，病理诊断为腺癌。手

比重试验中不同方法对试样中不同粒径的土重有各自的限定，当试样中既有粒径大于5mm的土颗粒，又含有粒径小于5mm的土颗粒时，取粒组颗粒比重的（）

A.平均数

B.加权平均值

C.大于5mm的土颗粒比重

吴茱萸汤的功用是( )

A．温中散寒，缓急止痛
B．温中补虚，缓急止痛
C．温中补虚，降逆止呕
D．温中散寒，益气健脾
E．温中补虚，降逆止痛

WLANs are increasingly popular because they enable cost-effective connections amongpeople, 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 （1） to improve their efficiency and reduce （2）. 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 （3） 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 （4）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 management by integrating with customers’ existing systems, such as OpenView. Fortunately, it isn’t necessary to measure these benefits to justify investing in WLAN management solutions, which can quickly pay for themselves simply by minimizing time-consuming（5）and administrative chores.

2（）

A.personnel 

B.expenses 

C.overhead 

D.hardware

A、D均为黑色固体（D为常见金属，粉末成黑色），B为胃酸的主要成分，C为蓝色溶液，D、E、F均为单质（F也为常见金属）。下图为这些物质的转化关系，其中部分反应物、生成物、反应条件已省略。

（1）请写出下列物质的化学式：E_______，F________。

（2）反应①基本类型是__________（填写基本反应类型）。

（3）写出反应②的化学方程式_____________________。

否定之否定规律揭示了事物发展的( )。

A．源泉和动力

B．方向和道路

C．形式和状态

D．结构和层次