China always upholds the principle of mutual benefit on an equal footing in trade and economic cooperation.
中国开展对外经贸合作一直秉持平等互利原则。
The structure, principle, parameter selection and economic benefit of bolt support in extraction tunnel are introduced.
介绍了在回采巷道中锚杆支护的结构、原理、 参数选择及所收到的经济效益。
The origin, principle, characteristics, application, economic benefit and limitation of continuously flowing analytical method with air isolation are introduced.
介绍空气隔断连续流动分析法的产生、原理、特点、应用、经济效益及局限性。
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