(2011年·衡阳) 关于甲、乙、丙、丁四个装置(如下图所示)的说法不正确的是(

题型:选择题

问题:

(2011年·衡阳) 关于甲、乙、丙、丁四个装置(如下图所示)的说法不正确的是( )

A.甲装置可用作制取氧气的发生装置

B.乙装置可用作制取二氧化碳的发生装置

C.可用丙装置收集氢气

D.可用丁装置收集氧气

考点:氧气的制取和收集氢气的制取和收集二氧化碳的制取和收集实验室制取和收集气体的思路
题型:选择题

某省L市旅游协会为防止零团费等恶性竞争,召集当地旅行社商定对游客统一报价,并根据各旅行社所占市场份额,统一分配景点返佣、古城维护费返佣等收入。此计划实施前,甲旅行社主动向反垄断执法机构报告了这一情况并提供了相关证据。关于本案,下列哪些判断是错误的?

A.旅游协会的行为属于正当的行业自律行为 

B.由于尚未实施,旅游协会的行为不构成垄断行为 

C.如构成垄断行为,L市发改委可对其处以50万元以下的罚款 

D.如构成垄断行为,对甲旅行社可酌情减轻或免除处罚

题型:选择题

阅读理解。

     Canadian scientists have found a method to help aging people get less forgetful by improving their

cognitive (认知) abilities through well-designed training. Everyone experiences some degree of memory

loss and cognitive decline as they get older. The decline usually becomes noticeable after 50, when

people may find it slightly more difficult to focus on tasks, organize everyday jobs and remember how

to do things in the right order.

     A team of psychologists (心理学家) in Toronto created a strategy (策略) of cognitive training to help

people preserve these abilities."Our primary emphasis was on improving the use of general strategic abilities

because they are particularly weak to the aging process," Dr. Donald Stuss, director of the study, said in

a press release. The team examined 49 healthy older adults with normal cognitive decline. All of the

participants were between the ages of 71 and 87. Over the course of 12 weeks, psychologists taught them

methods to improve their strategic abilities. Afterwards, researchers saw a 15 to 40 percent improvement

in the memories of all participants."Over a period of six months their improvement not only maintained, but

increased," said Dr. Gordon Winocur, coordinator of the study.

     The 12-week course was broken up into three four-week sections, focusing on a different skill involved

in strategic abilities: memory, goal management and psychosocial function.

     The memory training emphasized how to preserve and recover information, while goal management

focused on methods to lower the chance of memory slips. Psychosocial training was aimed at increasing

the participants' confidence in their mental abilities.

     "We wanted to develop a cognitive training program that would produce improvement over a relatively

short period of time, so participants could benefit more on that while they're still functional and slow down

the rate of decline," said Winocur. "If we can work with people in the early stages of cognitive decline, then

we can slow down the rate of this decline and help them maintain a higher level of function for a longer period

of time." 

1. What can be a suitable title for the passage?

A. Canadian scientists help aging people preserve memory.

B. A new way to develop a good memory.

C. Cognitive abilities are essential to memory.

D. Say no to the memory decline.

2. According to the psychologists, what causes the bad memory when a man becomes old?

A. Forgetfulness.

B. Psychosocial function.

C. General strategic abilities.

D. Goal management.

3. The underlined word "maintained" means"_____".

A. weakened

B. kept

C. changed

D. improved

4. How many strategic abilities do the psychologists mainly focus on?

A. Two.

B. Three.

C. Four.

D. Five.

5. From what Winocur said in the last paragraph, we can learn that ________.

A. the cognitive training program has been proved successful

B. the training can prevent one's memory from declining

C. the earlier they begin the training, the better the result will be

D. Winocur aims to help aging people suffer less from memory loss and cognitive decline

题型:选择题

限制谐振过电压的措施有()。

A.提高断路器动作的同期性

B.高抗中性点加装小电抗

C.防止发电机自励磁

D.选用灭弧能力强的断路器

题型:选择题

网络互连系统中,网桥工作在()。

A.物理层

B.数据链路层

C.应用层

D.网络层

题型:选择题

选择性高的药物有以下哪些特点()

A.药理作用多

B.药理作用少

C.副作用多

D.副作用少

E.毒性高

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