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板厚在5mm以下，焊接时一般开双V形坡口。( )
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Questions 15 to 17 are based on a talk on student housing. You now have 15 seconds to read Questions 15 to 17. Which are not a regular part of the student dorms
Part A You will hear a monologue about loneliness. As you listen, answer Questions 1 to 10 by circling True or False. You will hear the conversation ONLY ONCE. You now have 1 minute to read Questions 1 to 10. Psychologists say there are two different kinds of loneliness.
如果熔孔作的过大，引弧后焊缝背面余高过高，甚至烧穿。( )
立焊位置焊接时，熔池金属与熔渣容易分离。( )
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