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防锈铝焊前母材冷作硬化程度越（ ），软化越（ ）
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（ ）铝在高温下具有良好的塑性，故适于制造锻件及冲压件，可以进行淬火时效强化，
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纯铝是银白色的轻金属，密度2.7g.cm-3,约为钢的（ ），熔点为（ ）℃
[音频]Contrary to the old warning that time waits for no one, time slows down when you are on the move. It also slows down more as you move faster, which means astronauts some day may 1)_________ so long in space that they would return to an Earth of the 2) _________ future. If you could move at the speed of light, your time would stand still, if you could move faster than light, your time would move 3) _________.Although no form of matter yet 4) _________, moves as fast as or faster than light, 5) _________ experiments has already confirmed that accelerated 6) _________ causes a traveler’s time to be stretched. Albert Einstein 7) _________ this in 1905, when he 8) _________ the concept of relative time as part of his Special Theory of Relativity. A search is now under way to 9) _________ the suspected existence of particles of matter that move at a speed greater than light. And therefore, might serve as our 10) _________ to the past. An obsession with time--saving, gaming, wasting, losing and mastering it-- seems to have been a part of 11) _________ for as long as human have existed. Humanity also has been 12) _________ with trying to capture the meaning of time. Einstein used a definition of time for 13) _________ purposes, as that which is measured by a clock. Thus time and time’s relativity are measurable by any 14) _________, alarm clock, or atomic clock that can measure a billionth of a 15) _________.
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