Producing cystine with hair
zhu hong (zhejiang information engineering school; chemical teaching and research section; huzhou zhejiang 313000; china)
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The development of the testing set of programming PLC
li yao-gang 1; liu xue-dong 1; shui lan-su 2 (1 department of mechanical engineering; hebei institute of techndogy; tangshan hebei 063009; china; 2 department of resources engineering; hebei institute of technology; tangshan hebei 063009; china)
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