单项选择题X 纠错
A.4s,6sB.4s,4sC.6s,4sD.6s,6s
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单项选择题
A.≥0.5mB.≥0.7mC.≥0.9mD.≥1.0m
A.30°B.45°C.60°D.90°
A.10Hz~10KHzB.10Hz~20KHzC.20Hz~10KHzD.20Hz~20KHz
A.10kN,0.01kNB.10kN,0.1kNC.20kN,0.01kND.20kN,0.1kN
A.50mm*50mmB.71.5mm*71.5mmC.100mm*100mmD.150mm*150mm
A.2个,5℃B.4个,5℃C.2个,4℃D.4个,4℃
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