Supplement to Selections of China Mainland Magazines, 第 45-50 期American Consulate General, 1973 |
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第 1 到 3 筆結果,共 22 筆
第 8 頁
... rock generally contains more magnetite and thus gives higher readings on a magnetometer . An instrument that aids in aerial or shipboard mapping is the magneto- meter , which measures the magnetic pull of various subsurface rock ...
... rock generally contains more magnetite and thus gives higher readings on a magnetometer . An instrument that aids in aerial or shipboard mapping is the magneto- meter , which measures the magnetic pull of various subsurface rock ...
第 10 頁
... rock contours and character . Excavation of tunnels through rock proceeds by repeating the following cycle of operations for the length of the tunnel : drilling blast holes , loading the holes with explosives , setting off the ...
... rock contours and character . Excavation of tunnels through rock proceeds by repeating the following cycle of operations for the length of the tunnel : drilling blast holes , loading the holes with explosives , setting off the ...
第 11 頁
In all but the hardest rock formations , tunnels must be timbered as the excavation proceeds . Timbering is necessary to prevent rock from falling during blasting and to support masses of granite weakened by the excavation . Since ...
In all but the hardest rock formations , tunnels must be timbered as the excavation proceeds . Timbering is necessary to prevent rock from falling during blasting and to support masses of granite weakened by the excavation . Since ...
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