下表为家庭中一些常见物质的pH。 物质食醋牙膏食盐水肥皂水酱油pH2~38~97

题型:选择题

问题:

下表为家庭中一些常见物质的pH。

物质食醋牙膏食盐水肥皂水酱油
pH2~38~97104~5
 

蚊子、蜂等昆虫叮咬人时,会向人体射入一种酸性物质,使人的皮肤红肿、瘙痒、疼痛,要消除这种症状,可在叮咬处涂抹下列物质中的(  )

A.牙膏或肥皂水       B.食盐水

C.酱油               D.食醋

考点:中和反应及在实际中的应用酸的性质碱的性质
题型:选择题

The deserted island is only _______ by boat.

A.suitable

B.practical

C.available

D.accessible

题型:选择题

“后”、“王”的称谓源自何时“天子”一称在何时出现夏、商、周三代最高统治者都称什么?

题型:选择题

某放大电路的微变等效电路如图7-54所示,已知RB=82kΩ,,RC=5.6kΩ,=4.2kΩ,,RL=22kΩ,则电路的输入电阻ri和输出电阻r0分别为()。

A.ri=82kΩ,r0=5.6kΩ

B.ri=4kΩ,r0=4.5kΩ

C.ri=4kΩ,r0=5.6kΩ

D.ri=4.2kΩ,r0=22kΩ

题型:选择题

Want a glance of the future of health care Take a look at the way the various networks of people about patient care are being connected to one another, and how this new connectivity is being exploited to deliver medicine to the patient—no matter where he or she may be.
Online doctors offering advice based on normal symptoms are the most obvious example. Increasingly, however, remote diagnosis will be based on real physiological data from the actual patient. A group from the University of Kentucky has shown that by using personal data assistance plus a mobile phone, it is perfectly practical to send a patient’s important signs over the telephone. With this kind of equipment, the cry asking whether there was a doctor in the house could well be a thing of the past.
Other medical technology groups are working on applying telemedicine to rural (countryside) care. And at least one team wants to use telemedicine as a tool for disaster need—especially after earthquakes. On the whole, the trend is towards providing global access to medical data and experts’ opinions.
But there is one problem. Bandwidth is the limiting factor for sending complex medical pictures around the world—CT photos being one of the biggest bandwidth users. Communication satellites may be able to deal with the short-term needs during disasters such as earthquakes or wars. But medicine is looking towards both the second-generation Internet and third-generation mobile phones for the future of remote medical service.
Doctors have met to discuss computer-based tools for medical diagnosis, training and telemedicine. With the falling price of broadband communications, the new technologies should start a new time when telemedicine and the sharing of medical information, experts’ opinions and diagnosis are common.

The "problem" in the fourth paragraph refers to the fact that ______.

A. bandwidth isn’t big enough to send complex medical pictures
B. the second-generation of Internet has not become popular yet
C. communication satellites can only deal with short-term needs
D. there is not enough equipment for spreading the medical care

题型:选择题

在考生文件夹中,“sarnp1.accdb”数据库文件已建立了3个关联表对象(名为“线路”、“游客”和“团队”)和窗体对象“brow”。试按以下要求,完成表和窗体的各种操作。

修改“brow”窗体对象的属性,取消“记录选择器”和“分隔线”显示,将窗体标题栏的标题改为“线路介绍”。

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