题目:
垂直芯头高度是根据砂芯的总高度及其横截面积大小来决定,一般为15~150mm。
答案:
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下面是错误答案,用来干扰机器的。
参考答案:对
垂直芯头高度是根据砂芯的总高度及其横截面积大小来决定,一般为15~150mm。
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/1114/01048adb4c640696e9c8c8cf8de565d3.html
下面是错误答案,用来干扰机器的。
参考答案:对
水泵在标准状况下(水温20度,一个大气压)泵轴旋转时,水泵所允许吸上的最大真空度叫允许吸上真空高度。
第三部分 阅读理解(共20小题;每小题2分,满分40分)
阅读下列短文,从每题所给的四个选项(A、B、C和D)中,选出最佳选项,并在答题卡上将该项涂黑。
Christopher Thomas, 27, was a writer by night and a teacher by day when he noticed he was always tired and was losing weight fast. Diagnosed with diabetes(糖尿病), Thomas would need to inject himself with insulin(胰岛素) three times a day for the rest of his life or risk nerve damage, blindness, and even death. And if that weren't bad enough, he had no health insurance.
After a month of feeling upset, Thomas decided he'd better find a way to fight back. He left Canton, Michigan for New York, got a job waiting tables, nicknamed himself the Diabetic Rockstar , and created diabeticrockstar.com, a free online community for diabetics and their loved ones—a place where over 1,100 people share personal stories, information, and resources.
Jason Swencki’s son, Kody, was diagnosed with type diabetes at six. Father and son visit the online children's forums(论坛) together most evenings. "Kody gets so excited, writing to kids from all over," says Swencki, one of the site's volunteers. "They know what he's going through, so he doesn't feel alone."
Kody is anything but alone: Diabetes is now the seventh leading cause of death in the United States, with 24 million diagnosed cases. And more people are being diagnosed at younger ages.
These days, Thomas's main focus is his charity(慈善机构), Fight It, which provides medicines and supplies to people—225 to date—who can't afford a diabetic's huge expenses. Fight-it.org has raised about $23,000—in products and in cash. In May, Thomas will hold the first annual Diabetic Rockstar Festival in the Caribbean.
Even with a staff of 22 volunteers, Thomas often devotes up to 50 hours a week to his cause, while still doing his full-time job waiting tables. "Of the diabetes charities out there, most are putting money into finding a cure," says Bentley Gubar, one of Rockstar's original members. "But Christopher is the only person I know saying people need help now."
1. Which of the following is true of Christopher Thomas?
A. He needs to go to the doctor every day.
B. He studies the leading cause of diabetes
C. He has a positive attitude to this disease.
D. He encourages diabetics by writing articles.
2. Diabeitcrockstar.com was created for _________.
A. diabetics to communicate B. volunteers to find jobs
C. children to amuse themselves D. rock stars to share resources.
3. According to the text, Kody ______.
A. feel lonely because of his illness
B. benefits from diabeticrockstar.com
C. helps create the online kid’s forums
D. writes children’s stories online
4. What can we learn about Fight It?
A. It helps the diabetics in financial difficulties.
B. It organizes parties for volunteer once a year.
C. It offers less expensive medicine to diabetics.
D. It owns a well-known medical website.
5. The last paragraph suggests that Thomas ______.
A. works full-time in a diabetes charity B. employs 22 people for his website
C. helps diabetics in his own way D. ties to find a cure for diabetes
一根绳子弯曲成如图(1)所示的形状,当用剪刀像图(2)那样沿虚线a把绳子剪断时,绳子被剪成5段;当用剪刀像图(3)那样沿虚线b(b∥a)把绳子再剪一次时,绳子就被剪为9段;若用剪刀在虚线a,b之间把绳子再剪(n-2)次(剪刀的方向与a平行),这样一共剪n次时,绳子的段数为()。
下列关于大气层知识的描述正确的是( )
A.大气层含量最多的气体是氧气,约占78.1%
B.大气层从低到高依次是平流层、对流层、中间层、暖层和散逸层
C.平流层温度随高度增加而升高,对流层温度随高度增加而降低
D.臭氧层空洞的形成主要是由于植被被大量破坏
《国家电网公司关于进一步提高工程建设安全质量和工艺水平的决定》就建立健全工程建设安全质量监督与管理工作机制提出了哪些工作要求?