6.2 Pumping considerations Since the rate of separation depends on the oil globule size it will be appreciated that any disintegration of oil globules in the oily feed to the separator should be avoided and this factor can be seriously affected by the type and rating of the pump used. Tests were carried out by a British government research establishment some years ago on the suitability of various pumps for separator feed duties (Double vane, Triple screw and Single vane )

Cleaning, overhaul, lubrication. Satisfactory functioning cannot be ensured unless the parts in contact with liquid are carefully cleaned before assembly. This applies particularly to seal rings, sliding surfaces, guiding and contact surfaces, and threads. Also take care that no burrs are knocked up on the metal parts when handling them. Follow the directions given in chapter 5.4 and 4.5

Foreword 2 Introduction 4 Risk tradition and risk trading 6 From conjecture to calculation 8 The birth of modern insurance 10 Global expansion 16 Reinsurance 24 San Francisco 26 Swiss Re History 30 Money matters 38 World War II 44 Booming economy and growing problems 46 More money matters 50 A poor start for the 21st century 54 Natural catastrophes 56 Financial catastrophes, regulation, and a positive outlook 60

• The Tradition of Public Speaking • Public Speaking and Intercultural Communicative Competence • Public Speaking and Critical Thinking • Public Speaking and Ethics

Atomic structure Lewis Structures Resonance Structural Formulas Acids and Bases

 Gram-negative, obligate intracellular coccobacilli bacteria that infect mammaols and arthropods  Rickettsiae are transmitted in the arthropods,which serves as both vector and reservior  Both DNA and RNA  Is sensitive to antibiotic  Culture：in animate media

General outline small digestive glands distributed in the wall of digestive tract esophageal glands, gastric glands and intestine glands large digestive glands outside the wall of digestive tract salivary glands, liver and pancreas

Collisions: All around us (cars, buses) Grand astronomical scale (stars, galexies) Nuclear, atomic and molecular physics The impulse-momentum theorem relates the change in the momentum of a system to the total force on it and the time interval during which this total forces acts

3.3 Batch and continuous lubricating systems For small or medium units without a circulatory lubricating system, the oil is often treated on the batch system. As large a quantity of oil as possible is drained from the engine at intervals and run into a heating tank, the system being replenished with clean oil at the same time

Words and Phrases Direction: you are going to hear some of track and field world records. Complete the Chart. Pay special attention to the country and the records. Events