题目内容
有一传递动力的闭式直齿圆柱齿轮传动，现设计主、从动轮均为软齿面钢制齿轮，精度等级取为7级。如欲在中心距和传动比不变的条件下提高其接触强度，在下列措施中，最有效地是___。
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对于闭式硬齿面齿轮传动，宜取较少齿数以增大模数。其目的是___。
设计齿轮传动时，增大齿宽可提高轮齿的强度，但过大的齿宽又会使齿向载荷分布不均的程度增大，因此，选取齿宽系数要适当。在___情况下，齿宽系数应取较小值。
Task 2 Complete the following sentences with the words or phrases from Task 1. Change the form if necessary.1. This restaurant is an excellent place for ______________ business guests.2. Some parents insist that children learn good table ________ at home.3. He said he agreed with us, but the way he spoke _________ something else.4. Something should be done about this as a matter of_______.5. The secretary dreamed of having some kind of software to organize her files _______________.6. You’d better wear a tie, because this is a(n) ___________ party.7. She wanted to learn how to ____________ herself in a job interview.8. We need to find a(n) ______________ person to give us some advice on this matter.9. To my surprise, the stranger ____________ to be an old friend of my mother’s.10. Thomas is the _____________ of his fellow workers at the meeting.
Task 3 Rewrite each of the following sentences with the words or phrases given in the brackets. Change the form if necessary.He has obtained a good reputation for his business. (build up)
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