正确答案: A

腹股沟直疝

题目：患者，男性，78岁，双侧腹股沟部出现圆形肿物，不降入阴囊，平卧时可消失，应首先考虑的诊断是（）。

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学习资料的答案和解析：

[单选题]假设干扰因子f取0.6，话音激活因子Vf取0.4，功控因子ηc取0.8，按8KEVRC计，取Eb/Nt为4dB，根据极限容量公式可以计算出全向单载频基站的容量Nmax为：（）

A、63信道

[单选题]孕妇在孕期多少周，经阴道直肠拭子培养出哪种细菌可引起新生儿肺炎、脑膜炎和败血症（）

35～37周，培养出无乳链球菌

解析：常规孕期35～37周做阴道-直肠拭子培养，筛查无乳链球菌对早发性GBS感染的婴儿有着非常重要的临床意义。

[单选题]Logistics System A logistics system consists of different functions and activities,such as the following: 1.Customer service is a core function in the logistics process.Each business entity should have a customer service department to handle complaints,special orders,loss and damage claims,returns,bills problem,and etc．This function becomes crucial because any dissatisfaction can lead to failure to retain customers. 2.Inventory management is to maintain the stock of raw materials and half-finished products.In order to satisfy the customers＇demand and minimize costs,a company should establish an optimal level of inventory to meet the market demand that exceeds our expecta-tions,and at the same time,minimize your inventory holding costs and inventory write-down costs. 3.Transportation has taken a great role in many logistics systems for two reasons.First of all,globalization and importing-exporting activities make most products necessary to be transferred from one country to another.Secondly,information revolution has propelled the manufacturing process and consumer behaviors to be changed drastically.Traditional trans-portation methods need to be upgraded to accommodate modern transportation demand,therefore,containerization and usage of information sharing system emerge. 4.Storage is needed to manage the materials and store ready-for-market products in warehouses.There is new technology applied in the storage,for example,automatic ware-house.Old-fashioned warehouse has become the distribution center where container trucks deliver and pick up the goods. 5.Information system links all logistics processes and integrates all information to en-sure all the handling of large quantity of goods are delivered in an efficient,cost-effective and accurate manner. Questions:

[单选题]高锰酸钾一般不能用于（）。

置换滴定

[单选题]桥吊司机不准依靠行程开关和（）停止各机构的动作。

C、限位器