A Division of The McGraw-Hill Companies

All rights reserved. Except as permitted under the United States Copyright Act of 1976, no part of this publication may be reproduced or distributed in any form or by any means, or stored in a data base or retrieval system, without the prior written permission of the publisher.

7890 IBT/IBT 0 1 1 0 9 8 7

ISBN 0-07-018131-4

The sponsoring editor of this book was Linda Ludewig, and the production supervisor was Pamela Pelton.

McGraw-Hill books are available at special quality discounts to use as premiums and sales promotions, or for use in corporate training programs. For more information, please write to the Director of Special Sales, McGraw-Hill, Professional Publishing, Two Penn Plaza, New York, NY 10121-2298. Or contact your local bookstore.

Information contained in this work has been obtained by The McGraw-Hill Companies, Inc. ( McGraw-Hill ) from sources believed to be reliable. However, neither McGrawHill nor its authors guarantees the accuracy or completeness of any information published herein and neither McGraw-Hill nor its authors shall be responsible for any errors, omissions, or damages arising out of use of this information. This work is published with the understanding that McGraw-Hill and its authors are supplying information but are not attempting to render engineering or other...