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齿轮传动的三种形式是、、__。

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轴承是用来轴的。滚动轴承分为、和三类。

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.