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标准文献的主体是标准。()
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Dear Sir, We are a leading dealer in waterproof garments． Our customers have expressed interest in your raincoats and enquired about their quality． Provided quality and price are satisfactory there are prospects of good sales here, but before placing a firm order we want to make a trial salE．We should be glad if you would send us, on fourteen day's approval, a selection of men's and women's raincoats． Any of the items unsold at the end of the period, and which we decide not to keep as stock, would be returned at our expense． We look forward to hearing from you soon． Yours sincerely,

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