Scientific selection of workers is the second principle.
工人科学选择是第二个原则。
Through careful selection and individual, scientific training.
经过精心挑选和个人，科学训练。
Selection of a Scientific Research Topic for a lifetime study.
选题---选择一门可进行终身研究的学问；
The selection must follow the scientific way and stress experience in principle.
进队选材要遵循科学选材和经验选材相结合的原则。
The selection must follow the scientific way and stress experience in principle.
进队选材要遵循科学选材和经验选材相结合的原则。
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