We must find economical methods for extracting oil from shale.我们必须找到从页岩中采油的经济方法.Because some strata carbonaceous shale, the result of geophysical work was infected.因部分地层中含有碳质板岩, 对地球物理工作的结果产生了一定的影响.We can extract oil from...
九的六次幂是多少?How much is the sixth power of nine?2的3次幂是8.The cube of 2 is 8.如果愿意的话,我们也可用幂级数法解题.We can solve it with the power - series method if we want....