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轴承是用来轴的。滚动轴承分为、和三类。

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常用键的种类有、、、。

解释下列螺纹标记的意义（1）M24LH-5H-S（2）M20X1.5-5g6g（3）Tr32X6LH-7H（4）B40X14(P7)-8e-L

[音频]Directions: In this section, you will hear one health report. Listen to the health report and fill in the blanks.World Bank Approves $12 Billion to Finance Coronavirus Vaccines, CareThe World Bank has approved $12 billion in financing to help poor countries buy and give out 1.___ vaccines, tests and treatments. The aim is to support the 2. _ of up to 1 billion people in the developing world.The $12 billion in financing is part of a larger World Bank Group effort. It plans to spend up to $160 billion to help developing countries fight the COVID-19 3. _, the bank said in a statement on Tuesday.The World Bank said its COVID-19 emergency programs are already reaching 111 countries.People in developing countries need safe and 4. _ COVID-19 vaccines, it said.The World Bank is “fast-tracking” its delivery systems so that poorer nations “have fair and equal 5. _ to vaccines,” said the bank’s president, David Malpass. He added that fair and equal access was important to defeat the pandemic and to “help countries 6. _catastrophic economic and fiscal impacts.”The International Finance Corporation is the agency of the World Bank that provides loans to private businesses. It is giving money to vaccine 7. _ through a $4 billion Global Health Platform, the bank said. Researchers are working on creating more than 170 possible COVID-19 vaccines.The disease has killed more than 1 million people and sickened more than 38 million. It has also 8. _ many economies and left many people out of work.The world’s richest countries have already bought up most of the world’s possible COVID-19 vaccine supply through 2021. This has made health experts 9. _that poorer countries will not be able to get the vaccine.The World Bank said it will use expertise and experience from its involvement in many large 10. ___ programs worldwide and other public health efforts. The financing also is meant to help countries get medical tests and treatments and to support direction of logistics for vaccinations in the developing world.I’m Susan Shand.

Directions: In this section, there is a passage with ten blanks. You are required to select one word for each blank from a list of choices given in a word bank following the passage. Read the passage through carefully before making your choices. Each choice in the bank is identified by a letter. You may not use any of the words in the bank more than once.Rock and roll is a genre of popular music that evolved in the United States in the late 1940s and early 1950s. Its 1 lie mainly in blues, rhythm and blues, country, folk, gospel, and jazz. The style subsequently spread to the rest of the world and developed further, leading ultimately to 2 rock music.The term “rock and roll” now covers at least two different meanings, both in common usage. The American Heritage Dictionary and the Merriam-Webster Dictionary both 3 rock and roll as synonymous with rock music.4 , defines the term as referring specifically to the music of the 1950s.Classic rock and roll is 5 played with one or two electric guitars, a string bass or an electric bass guitar, and a drum kit. In the 6 rock and roll styles of the late 1940s, either the piano or saxophone was often the lead instrument, but these were generally 7 or supplemented by the guitar in the middle to late 1950s.The massive popularity and eventual worldwide view of rock and roll gave it a 8 social impact. Far beyond simply a musical style, rock and roll, as seen in movies and in the new medium of television, 9 lifestyles, fashion, attitudes, and language. It went on to spawn various sub-genres, often without the initially 10 backbeat, that are now more commonly called simply “rock music” or “rock”.