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试简述焊接过程中常见的缺陷。
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Underline the object clauses in the following sentences.1. Last year I decided I'd like to study psychology.2. I was about to give up when a friend suggestedthat I try a MOOC.3. At first, I had no idea what they were talking about, but they explained that a MOOC is a Massive Open Online Course, which is designed so that anyone can follow it, regardless of age, location or education — all you need is an Internet connection. You can search for hundreds of different subjects, and can usually watch a short introduction video to get an idea ofwhat the course is about.4. Most MOOCs have online forums too, where students can discusswhat they are learning.5. Research shows that 90% of students who start a MOOC do not finish it, and I can see why.
某灯泡上标有“220V 40W”字样，说明灯泡的额定电压为（ ）V。
甲灯“220V 40W”，乙灯“220V 60W”，正常工作时哪个更亮。（ ）
用万用表检测灯泡电阻，若指针指向∞，则说明该灯（ ）
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