快速看过岩块, 寻找岩质较松有裂缝的地方.Scan the rock, look for cracks that create a loose area.目的确定天然裂缝对人工压裂裂缝的影响.Purpose To determine the effect of in - situ fractures upon artificial fracturized ones.对裂缝的出现和预应力的变化规律作了相应的阐释.The changes o...
Prices at the fairs are stable with a slight decline.价格稳中有降.Innovation has always been a hallmark of world's fairs and expositions.创新历来是世界交易会和博览会的一项标志.Our company puts up exhibIt'stands at fairs and expositions...
我给表上紧发条，听着它嘀嗒作响。I wound up the watch and listened to it tick.手表停了还是手表,还能重新上紧发条.A run - down watch is still a watch and can be rewound.时钟不走了,上紧了的发条内所储存的能量到哪里去了?What happens to the energy stored in a wound clockspring when...