Stupid mental state; Deduce; Morals education; Blind area.
无知心理；演绎；道德教育；盲区。
But with some reasons, both of the pipe ends have blind area.
但因种种原因，钢管两端存在探伤盲区。
Cm high sensitivity rate above 98% magnetic alarm and minimum blind area of similar products.
长6厘米以上的磁条报警率可达到98%，且盲区同类产品最小。
Cm high sensitivity rate above 98% magnetic alarm and minimum blind area of similar products.
长6厘米以上的磁条报警率可达到98%，且盲区同类产品最小。
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