问题
单项选择题
刚刚完成焊接工序的焊缝温度尚未完全冷却下来，应如何决定何时实施渗透探伤工作？（）
A、焊接完成后即可检测，因为此时焊道温度高可以增加渗透作用
B、至少要等10分钟后才可以开始检测
C、至少要等30分钟后才可以开始检测
D、用手小心触摸焊道，只要焊道温度不超过手温即可实施检测
答案
参考答案：D
搜题请搜索小程序“爱下问搜题”
刚刚完成焊接工序的焊缝温度尚未完全冷却下来，应如何决定何时实施渗透探伤工作？（）
A、焊接完成后即可检测，因为此时焊道温度高可以增加渗透作用
B、至少要等10分钟后才可以开始检测
C、至少要等30分钟后才可以开始检测
D、用手小心触摸焊道，只要焊道温度不超过手温即可实施检测
参考答案：D
通读下面短文，掌握其大意，然后在各题所给的四个选项(A、B、C和D)中选出一个最佳选项。  With that, he thanked me happily and started off on his bike. I 44 heard him singing as he rode away. I got a warm 45 inside. I now understand what it 46 by the saying “Giving is getting”.47 it was only a little action, I got and learned more in those two minutes than I did in the rest of the month. Everyone in the world 48 help. Everyone can give help and everyone can be helped. The look of that man’s happiness appears in my mind 49 I have the chance to do something nice. This is the power（力量）of 50 .
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