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James Watt（）the steam engine.
A was inventing
Binvented
Chad invented
Dhas invented
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drain the steam cylinderC
close the steam cylinder drainsD
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单选题What is NOT a function of the steam drum of a marine water-tube boiler（）.A
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问答题Practice 2 The miracle silicon chip represents a development in the technology of mankind that over the past few years has acquired the force and significance associated with the development of hand tools or the discovery of the steam engine. Just as the Industrial Revolution took over an immense range of tasks from men’ s muscles and enormously expanded productivity, so the microcomputer is rapidly assuming huge burdens of tedious work from the human brain and thereby expanding the mind’s capacities in ways that man has only begun to grasp. With the chip, remarkable achievements of memory and execution become possible in everything from farms to banks to corporate offices.
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单选题The boiler feed pump discharge pressure is higher than the steam drum pressure to （）.A
ensure feed water flow into the boilerB
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单选题The water level in a steaming auxiliary boiler will always （）A
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单选题The distance from which a certain light is visible is directly proportional to the wattage of the light bulb. If the light is visible from 16 meters when a 40 watt bulb is used, from what distance is the light visible when a 75 watt bulb is used?A
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单选题Foaming in the steam drum may be caused by （） in a boiler.A
oxygen in the waterB
poor boiler designC
density too highD
excessive steam demand
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ThermostaticC
BimetallicD
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单选题James Watt （）the steam engine in 1796.A
discoveredB
had discoveredC
inventedD
had invented
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