问题 问答题 简答题

半导体芯片制造对厂房洁净度有什么要求?

答案

参考答案:

空气中的一个小尘埃将影响整个芯片的完整性、成品率,并影响其电学性能和可靠性,所以半导体芯片制造工艺需在超净厂房内进行。1977年5月,原四机部颁布的《电子工业洁净度等级试行规定》如下:

电子工业洁净度等级试行规定:

按器件产品种类和要求所采用的洁净标准:

阅读理解

阅读理解

    There's no better place to be than beside the seaside in the summer. And even in Britain you can still find beaches away from the crowds with golden sand.

                                             COMPTON BAY,ISLE OF WIGHT

     This wide sandy beach is on the south west coast,between Freshwater and Brook and is part of the

Tennyson Heritage Coast. There are striking views of the white cliffs further along the coast. A coastal

path passes behind the beach,and you can enjoy scenic cliff top walks in either direction.

     Accommodation:Sandpipers Hotel(01983 758150,www. sandpipershotel. com) with doubles from £10 pp.

                                                         KINGSGATE BAY,KENT

     Around the beach round a bend in the coastal road from Ramsgate is white cliffs with Kingsgate Castle dominating the whole landscape. It is fairly isolated,with few facilities,but is perfect for summer bathing or

for bracing winter walks.

     Accommodation:Fayreness Hotel(0188 86866,www. fayreness. com) with doubles with breakfast

from £69.50 pp.

                                                       RINGSTEAD BAY,DORSET

      A picturesque 210 ft crescent(弦月状)of pebbles with clean water-that's a perfect escape from some of the busier beaches around Weymouth. You reach it by passing through the village of Upton,then along a narrow country road. Next to the car park is a wellstocked shop. The cliffs behind Ringstead Bay are an

excellent place for fossil hunting.

Accommodation: Glenburn Hotel(01305 832318,www. glenburnhotel. com) with doubles from £ 79

including breakfast.

                                                         BRANSCOMBE, DEVON

     Lying on the East Devon Heritage Coast,Branscombe has good facilities with toilets and a car park

close to the beach,as well as a small picnic area. A wellstocked shop sells the most attractive dairy ice

cream. Next to the shop is the Sea Shanty restaurant-open every day until 5 pm during the summer.

     Accommodation:The Mason's Arms,Branscombe Village(01297 680300,www. masonsarms.co.uk)

with doubles from £65 pp with breakfast.

1. Which beach is the best wonderful place for summer bathing?

A. COMPTON BAY.

B. BRANSCOMBE.

C. KINGSGATE BAY.  

D. RINGSTEAD BAY.

2. In which of the following beaches,will you enjoy ice cream?

A. COMPTON BAY.  

B. BRANSCOMBE.

C. KINGSGATE BAY.  

D. RINGSTEAD BAY.

3. If you want to know more information about Fayreness Hotel,you'd better refer to the following website ________.

A. www. masonsarms.co.uk

B. www. fayreness. com

C. www. glenburnhotel. com

D. www. sandpipershotel. com

4. What's the purpose of the passage?

A. To attract more tourists.

B. To describe some beautiful beaches.

C. To tell us the most beautiful places in UK are beaches.

D. To tell us where to spend summer.

单项选择题