题目内容

利用标准公差数值表（附表3-2）和轴的基本偏差数值表（附表3-4）及公式（3-19），查表确定Φ30H8/k7和Φ30K8/h7配合中孔和轴的极限偏差（即ES、EI、es、ei），并计算其极限间隙或过盈。

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已知基孔制配合ф45H7/t6中，用查表法确定配合性质不变的同名基轴制配合ф45T7/h6的极限偏差，并判断配合性质。

有一孔、轴配合的基本尺寸为Ф30mm，采用基孔制配合，要求配合间隙在+0.020～+0.055mm之间,试确定孔和轴的精度等级和配合种类。

利用标准公差值表（附表3-2）和孔的基本偏差数值表（附表3-5）确定φ30P8/h8的极限偏差.

A. where the odour of waffle-cones were released into the air to encourage visitors to an out-of-the-way ice cream shopB. that his grandmother used to makeC. which typically includes more than six smellsD. whose recently-introduced cell phone keypad was lavender-scentedE. when it began twelve years agoF. why so many companies are now associating brands with a scentG. who walk around reception will get a whiff of a chocolate chip cookieWhat’s that smell?David Van Epps opens his briefcase and touches several of the 72 bottles inside. ‘Here’s one you’ll like,’ he says, taking the top off one. He dips a paper strip inside and waves it under his nose, breathing in deeply. It smell of sugar and butter like the ‘sugar cookies’ (1)______. It also makes him think of money: sugar cookies is only one of 1,480 fragrances sold by Van Epps’ company ScentAir Technologies and used to improve brand identity.Fragrance is as much a marketing tool these days as a logo, a slogan or a jingle. Sony puts its customers ‘in the mood’ for buying in its stores with the smell of vanilla and mandarin. At some Doubletree Hotels guests (2)_. And Proctor and Gamble has experimented with ScentAir scents to attract shoppers to displays in stores, says Van Epps. ‘What’s better than having a brand people want to use because of fragrance?’ScentAir first started putting that attitude into bottles (3)___. ScentAir will change as much as &25,000 to create a custom blend, (4). This year turnover has quadrupled as more marketers use scents to distinguish their brands.Once a client selects a scent, ScentAir puts the liquid aroma in a cartridge that fits inside a device with a fan which pushes the smell into the air. You control the strength with a dial. Monthly refills are &100 per device.Some companies want to make shoppers wait around longer in the hope they will spot something to buy. It seems to have worked at the Hard Rock Hotel in Orlando, (5). Sales jumped 45% in the first six months after a ScentAir device was installed. Westin Hotels and Resorts contacted ScentAir for a white tea fragrance to put in its 127 properties. Added to this, the hotels have just started selling white tea-scented items, including $36 candles.Alan Hirsch of the Smell and Taste Treatment and Research Foundation in Chicago explains the reason (6)_. ‘Smell has a greater impact on purchasing than everything else combined. If something smells good, the product is perceived as good.’ There’s LG Electronics (7)___, or the cherry smell from billboards advertising a new shampoo from L’Oreal. All we need now is a PC that can pick up aromas from websites.