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角变形等焊接变形在外载作用下会引起应力集中和附加应力，会引起产生焊接裂纹。( )
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Dear Sirs,We welcome your enquiry of January 11th and thank you for your interest in our embroidered (刺绣) linen (亚麻) products.As you may be well aware, we are a state-operated corporation handling this line of business for many years. So we are in the good position to serve our customers with the most reliable quality of the linen you suggested. We can make products according to the given design and produce the designed goods in large quantities.We are enclosing our illustrated catalogue giving the details you ask for. Also we are sending you a full range of samples and, when you have a chance to examine them, we feel confident that you will agree that the quality of material used and the high standard of workmanship will appeal to the most selective buyers.We hope the catalogue and samples will reach you in time and look forward to your order. Yours truly,ABC Ltd.Recommendation of productsProducts of ABC Ltd: (46) .Company kind of ABC Ltd: (47) .Characteristics of products of ABC Ltd:1. Products can be made on the basis of (48) and in large quantities.2. The samples will appeal to the most selective buyers because of the (49) and the high (50) . 48（）
闪光对焊机周围10m内应无易燃易爆物品。( )
凡方向和大小都不随时间变化的电流叫恒定直流电流。( )
100克的5倍是1千克的百分之几( )
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