题目内容
是对中小直径的孔进行半精加工和精加工的方法。
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铰孔粗铰时余量一般取，精铰时余量一般取为。
高速钢锪钻加工铝材料的切削用量为（）。
标准机用铰刀有4～12齿，由（）、颈部和柄部组成。
[音频]Section DSpot dictation. Listen to the following short passage, then fill in the blanks with the missing words or phrases. The passage will be read three times.There are about 3.7 million businesses in the UK. About 75% of British jobs are in (16) _________ industries--- hotels, restaurants, travel and shopping. These are the fastest (17) _________ businesses and employ over twenty million people. Most British people work five-day weeks. The working week is, (18) __________, the longest of any country in Europe. In 1998 a new law (19) _____.The law says that workers do not have to work more than 48 hours a week if they don’t want to. According to the law, British employers must give their workers (20 ) __________ of 24 days a year.
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