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step by step test
mech. 逐步【分段】试验
step-by-step test
earth.sc. 阶段检验; 逐步检验
el. 逐步测试
eng.geol. 阶段试验
expl. 逐级试验
oil 步进试验
space 逐步试验
tech. 步进制试验
step by step test: 3 phrases in 3 subjects
Space1
Technology1
Textile industry1