题目内容
297.焊接打底焊道时，为保证焊透，焊接电流要大些。
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298.中厚板焊接必须采用多层焊和多层多道焊。
299.碱性焊条收弧时不宜采用反复断弧收弧法。
300.气焊、气割时，氧气的消耗量比乙炔大。
Before you go for a hike, be sure to get ready （1） whatever you may need beforehand. First, you should get（2） with your route and destination. Also, you should take your cell phone with you. What’s （3）, you should pack the following （4）:* Food and drink;* First-（5） kit with necessary medicines;* Waterproof clothes; and sunscreen;* Flashlight, pocket knife or utility tools;* Whistle;* Matches in a waterproof container, or a cigarette lighter, andtwo or three candles;* An （6） mobile phone battery.The last thing to remember is to （7） someone fully informed of your （8） plan, which may include your route, destination, the duration, your means of transport, etc. （9） people may （10） on your whereabouts if necessary.
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