问题
单项选择题
用浸入法施加渗透剂时，滴落时间过长会造成渗透剂难于清洗，这时应（）
A、将零件激冷到0℃以下
B、将零件加热到60℃以上
C、将零件重新浸入渗透液中
D、在清洗前施加湿式显像剂
答案
参考答案：C
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用浸入法施加渗透剂时，滴落时间过长会造成渗透剂难于清洗，这时应（）
A、将零件激冷到0℃以下
B、将零件加热到60℃以上
C、将零件重新浸入渗透液中
D、在清洗前施加湿式显像剂
参考答案：C
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| Today it is quite natural to find people shake hands in some situations. People all over the world shake hands for many different 1 . We shake hands when we meet new people 2 during special festivals. Players often shake hands before or after 3 . Business people shake hands when they make a deal. Why do people shake hands 4 shaking feet? This is because of the fact that a long time ago most people 5 knives or guns. If some of them decided that they did not want to 6 , they would show their empty hands. 7 people shook hands so that they could not 8 knives in their sleeves (袖子). Later on, handshaking became a symbol of 9 . Now we don't have to 10 people with guns or knives. However, we still shake hands all the time! The reason is simple — it is still a way to show friendship. | ||||
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