Stainless steel is material commonly used for temperatures up to 50℃; beyond that and for severe corrosive conditions other materials are requiredThe bold and italic word “that” probably means （）.

A . watertight B . resistant to water C . so safe that no water will affect the hold D . so strong that no water will come into the hold

A . bevel B . seam C . butt D . bond

A . 动脉导管未闭 B . 主动脉瓣狭窄 C . 肺动脉瓣相对关闭不全 D . 重度主动脉瓣关闭不全 E . 室间隔缺损

A . cylinder liner B . coupling flange C . cylinder cover D . piston crow

A . being shrunk into B . to be shrunk into C . to be shrunk with D . shrinking into

A . Both seamless mild steel and copper may be used for middle pressure steam B . "hpair" means high pressure air C . The feed piping of the boilers can be made of seamless mild steel D . All oil pipings are made of mild steel

A . bracing B . battening C . blocking D . shoring

A . bracing B . battening C . blocking D . shoring

A . main bearing shells B . main bearing C . steel D . bearing metal

A . To support the overhang of the stern B . To provide strength to shell plating at the stern C . To add strength to the deck beams which support the weather decks D . To support the plating of a cylindrical tank

A . advantages B . disadvantages C . power advantages D . power disadvantage

A . flame temperature B . fuel oil C . air movement D . gas force

A . The aluminum will provide greater resistance to the spread of fire by conduction B . The aluminum structure is usually attached to a steel coaming by a method that insulates the two metals C . If the superstructure is stressed，an aluminum structure requires additional expansion joints to prevent fracture D . The steel at the area of the aluminum-to-steel connection must be closely checked for galvanic corrosio

A . heavy-walled drill pipe B . tool joint C . down hole tool D . drill collar

A . borrow B . lend C . take D . let

A . lot B . lots C . a lot D . the lot

A . snatch block B . threefold purchase C . handy-billy D . chockablock

The world's knowledge is said to be doubling every eight years. This knowledge【64】is stimulating economic progress. The need to collect, analyze, and communicate great【65】of information is producing new products and services, creating jobs, and【66】career opportunities. The information age is【67】considered to be a phenomenon of the service sector of the economy,【68】than a product of heavy industry. Certainly, rocketing information technologies are creating new capabilities【69】knowledge-based service spheres.【70】changes just as dramatic are【71】industry, giving people the【72】to do challenging work in exciting new ways. Manufacturing is full【73】in the information age. From design to production, the manufacturing【74】has long been information-intensive. It always has required exacting communication to describe what goes into products and how to make them. Now, computer technology is giving factory managers new【75】to gather all of this information and use it to control production. Telecommunications are producing error-free communication between the design office and the factory. Computer-aided design is enabling engineers to【76】product performances and manufacturing process on video displays, before resources are committed to build and test prototypes. Techniques like these are bringing【77】new advances in manufacturing productivity. Just as coal fueled the【78】to an industrial society, so microelectronics is powering the【79】of the information age. Microelectronic information management tools are【80】U.S. industrial capabilities, which remains【81】to America's economic wellbeing and national security. (63) A．seeking B．stimulating C．shaping D．securing

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A．rates B．thicknesses C．proportions D．densities

A．more than 0.35 B．less than 0.35 C．less than 0.035 D．more than 1