摘要
Due to the slow progress of energy-substitute technology, the demand for oil and natural gas has grown all over the world. As the easy-to-develop oil and natural gas resources become scarce, the exploitation of these resources must be extended to the deep-sea, deserts and the polar regions,
Due to the slow progress of energy-substitute technology, the demand for oil and natural gas has grown all over the world. As the easy-to-develop oil and natural gas resources become scarce, the exploitation of these resources must be extended to the deep-sea, deserts and the polar regions,