题目内容
Questions 18 to 20 are based on the following monologue about rainwater. You now have 20 seconds to read Questions 18 to 20. What characteristics of hard water does the speaker mention
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采用交流电时，因极性不断地变化，所以磁偏吹现象更为严重。( )
当焊条电弧焊弧长增加时，电弧静特性曲线上移。 ( )
中厚板焊接时，应该采用多层焊或多层多道焊。( )
You will hear five people talking about their jobs. For each extract there are two tasks. For Task One, choose the corresponding job for each one from the list A—H. For Task Two, choose the complaint described from the list A—H. You will hear the recording twice.
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