发动机活塞环中油环的主要作用是密封作用。

题型:判断题

问题:

发动机活塞环中油环的主要作用是密封作用。

考点:汽车驾驶员考试汽车驾驶员初级工考试汽车驾驶员初级工考试题库
题型:判断题

关于金属烤瓷全冠的牙体制备,不正确的是()

A.前牙应制备与牙长轴成40°的切斜面

B.后牙面磨除2.5mm的厚度

C.前牙唇面磨除1.0~1.5mm的厚度

D.龈下肩台的宽度为0.5mm

E.龈上肩台的宽度为0.7mm

题型:判断题

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 mantie 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 1968, Martin Luther King Jr. went to Memphis to help the garbage workers ______.

A.get relieved of some of their basic duties

B.know what environmental justice was

C.fight for better working conditions

D.recognize their dangerous surroundings

题型:判断题

请简述曹操割发代首的故事。

题型:判断题

下列关于文件传输(FTP)的描述正确的是()

A.这一协议使用户能在联网的计算机之间传送文件,但使用FTP不可以传送图像文件、声音文件

B.数字信息的存储与管理

C.文件传送协议(FTP:FlieTransferProtoco1)是Internet传统的服务之一

D.利用Internet的FTP服务,可以将网络课程下载到自己的计算机中,在未与网络连接的情况下,脱机学习网络课程

题型:判断题

关于腘窝瘢痕挛缩畸形采用瘢痕切除游离植皮法治疗,以下哪项是错误的

A.瘢痕切除后,充分松解创缘四周粘连,深部瘢痕也应完全切除,直到出现脂肪颗粒或深筋膜
B.切除瘢痕时,应注意不可伤及腓总神经及腘窝内的血管与神经
C.腘窝上下应为横行切口,两侧可作成锯齿形的辅助切口,并应超过正侧线
D.创面可用中厚游离植皮修复
E.植皮后下肢需用石膏托固定,3月后开始下床活动

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