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【单选题】
去除渗透剂前,零件必须被渗透剂润湿多长时间
A.
时间长短取决于使用渗透剂种类，被检材料种类，要求灵敏度和要检测缺陷的种类
B.
由于渗透剂在若干秒中就可能渗入任何尺寸的露出表面的不连续性中，所以施加渗透剂后应尽快开始去除渗透剂
C.
3分钟
D.
10分钟
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B.
When the daughter used a common American phrase about needing space.
C.
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D.
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【单选题】Unit 5 Part 3 Video Understanding main ideas. Watch the video for the first time. Choose the best answer to the following questions. Part3Video.wmv 1. What caused the mother to get most upset in the v...
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