The turbine casing completely surrounds the rotor and provides the inlet and exhaust passages for the steam. the casings of turbine cylinders are of simple construction to minimize any distortion due to temperature changes. casings are usually split horizontally to permit easier access for inspection and repair. the flanges are accurately machined to ensure a steam-tight metal-to-metal fit, and the flanges are strongly bolted together. flange seals, except for corrective maintenance measures, are not normally used. in some (high temperature) units, both top and bottom casing halves are made of two vertical casings bolted together and seal-welded. the inlet end is made of alloy steel (cr-ni), while the exhaust end is made of carbon steel. the flanges in the casing are bolted together. one method of joining the top and bottom halves of the cylinder casing is by using flanges with machined holes. bolts or studs are insertion into these machined holes to hold the top and bottom halves together. to prevent leakage from the joint between the top flange and the bottom flange the joint faces are accurately machined. another method of joining the top and bottom cylinder flanges is by clamps bolted radially around the outer of the cylinder.
Объяснение:
1 Who is Amancio Ortega?
He is The person
behind Zara. He is the richest
man in Spain, but very lew people know his face.
2.What is unusual about him?
Although he is a
multimillionaire businessman, he doesn't look
like one. He doesn't like wearing suits or ties and
prefers to wear jeans and a shirt.
3.What was his first job?
When he was young. he worked as a salesperson in a clothing store. but h
always dreamed of having his own business.
4.When did he open the first Zara store?
In 1975, al the age of 40. he opened
his first clothing store in La Coruna, a city in northwest Spain and named it
Zara.
5. Where are there Zara stores now?
Now you call find Zara stores all over the world. from New York to
Moscow to Singapore.
6.What are the secrets of Zara's success?
The main reason is that Zara reacts extremely quickly to the latest designer
fashions and produces clothes that are fashionable but inexpensive. Zara
can make a new line of clothes in three weeks
1. Sam's tired. He b** two kilometres.
a) hasn't swum yet b) has just swum c) have swum
2. Rob knows. I *A* him the result of the match.
a) have already told b) am telling c) have told already
3. Pat's not very good at riding her bike. **A
a) She's fallen off twice b) She's fallen twice off c) She twice has fallen off
4. Our holiday finishes tomorrow and I **C any postcards.
a) haven't wrote b) hasn't written c) haven't written
5. **C your mobile phone in the cinema?
a) Have you used ever b) Did you ever used c) Have you ever used
6. I *A* Simon's birthday present. He mustn't find it before tomorrow.
a) have hidden b) have hide c) has hidden
7. Neil's on holiday at the moment.' 'Oh, where C**?
a) is he going b) has he went c) has he gone
8. I *B* Italian. Now I want to learn Spanish.
a) already have studied b) have already studied c) just have studied
9. Mum and Dad are tired because they *B* a long way.
a) have drive b) have driven c) have drove
10. Three years ago I C** any French. Now I'm very good at it.
a) don't speak b) haven't spoken c) didn't speak
11. Tony *C* out, but he left a message for you.
a) just has gone b) has just been c) has just gone
12. 'How long has Sonia been unemployed? **A*?
a) For two months b) Since two months c) Two months ago
13. Lucy isn't ready to go to school. She *A* her breakfast yet.
a) hasn't had b) doesn't have c) hasn't have
14. I'm waiting to hear from Lisa. *C*?
a) Is she ringing yet b) Has she yet rung c) Has she rung yet
15. How long has Philip been writing books?' *B*
a) For his birthday b) Since he was a child c) Twenty years ago
16. Will has travelled all over the world, but A** to Ireland.
a) he's never been b) he's gone never c) he's never gone
17. Jon ** B his knee, so he can't walk.
a) has hurted b) has hurt c) huited
18. Has Dave ever B** a motorbike?
a) ride b) ridden c) rode
19. Mark *C* a cold for a week.
a) has b) is having c) has had
20. David A** in a helicopter, but he'd like to go.
a) has never been b) didn't ever go c) never was
Объяснение: