游泳的人潜入水中后,由于水对耳膜的压强作用,耳朵会有胀痛的感觉,下列说法正确的是

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问题:

游泳的人潜入水中后,由于水对耳膜的压强作用,耳朵会有胀痛的感觉,下列说法正确的是[ ]

A.潜入水中越深,胀痛的越厉害

B.在同一深度,耳朵向着水面下,比向着水面上,胀痛的感觉要好一些

C.在水中身体竖直向上时,左右耳朵都不感觉胀痛,因为两侧的压强都抵消了

D.以上说法都不正确

考点:液体压强的特点
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每一机构投资者持有的单一券种买断式回购未到期数量累计不得超过该证券券种发行量的10%。 ( )

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在△ABC中,∠A=50 °,AB=AC,AB的垂直平分线DE交AC于D,则∠DBC的度数是(    )°。

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下图是肌肉的协作关系示意图,据图分析回答下列问题:(8分)

(1)A表示的肌肉是_________   __,它是由                  两部分组成。

(2)当手臂处于(一)状态时,A处于__________状态,B处于__________状态。

(3)由(一)到(二)必须在               支配下才能完成。

(4)当手臂自然下垂时,A处于__________状态,B处于__________状态。

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依据华电集团《反违章管理指导意见》,每发生一次作业性违章,处罚违章者多少元?

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Almost every day the media discovers an African American community fighting some form of environmental threat from land fills, garbage dumps, petrochemical plants, refineries, bus depots, and the list goes on. For years, residents watched helplessly as their communities became dumping grounds.

But citizens didn’t remain silent for long. Local activists have been organizing under the mantle of environmental justice since as far back as 1968. More than three decades ago, the concept of environmental justice had not registered on the radar screens of many environmental or civil rights groups. But environmental justice fits squarely under the civil rights umbrella. It should not be forgotten that Dr. Martin Luther King, Jr. went to Memphis on an environmental and economic justice mission in 1968, seeking support for striking garbage workers who were underpaid and whose basic duties exposed them to environmentally hazardous conditions.

In 1979, a landmark environmental discrimination lawsuit filed in Houston, followed by similar litigation efforts in the 1980s, rallied activists to stand up to corporations and demand government intervention.

In 1991, a new breed of environmental activists gathered in Washington, D.C., to bring national attention to pollution problems threatening low-income and minority communities. Leaders introduced the concept of environmental justice, protesting that Black, poor and working-class communities often received less environmental protection than White or more affluent communities. The first National People of Color Environmental Leadership Summit effectively broadened what "the environment" was understood to mean. It expanded the definition to include where we live, work, play, worship and go to school, as well as the physical and natural world. In the process, the environmental justice movement changed the way environmentalism is practiced in the United States and, ultimately, worldwide.

Because many issues identified at the inaugural summit remain unaddressed, the second National People of Color Environmental Leadership Summit was convened in Washington, D. C., this past October. The second summit was planned for 500 delegates; but more than 1,400 people attended the four-day gathering.

"We are pleased that the Summit II was able to attract a record number of grassroots activists, academicians, students, researchers, planners, policy analysts and government officials. We proved to the world that our movement is alive and well, and growing. "says Beverly Wright, chair of the summit. The meeting produced two dozen policy papers that show powerful environmental and health disparities between people of color and Whites.

In Paragraph 1, the word "residents" refers to () in particular.

A. ethnic groups in the U. S.

B. the American general public

C. African Americans

D. the U. S. working-class

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