问题
单项选择题
加热炉吹灰时对管道预热的目的是（）。
A.保护吹灰管
B.排掉里边的水
C.防止液击
D.防止蒸汽过大对炉管有损伤
答案
参考答案：C
解析：A.保护吹灰管B.排掉里边的水C.防止液击D.防止蒸汽过大对炉管有损伤
搜题请搜索小程序“爱下问搜题”
加热炉吹灰时对管道预热的目的是（）。
A.保护吹灰管
B.排掉里边的水
C.防止液击
D.防止蒸汽过大对炉管有损伤
参考答案：C
解析：A.保护吹灰管B.排掉里边的水C.防止液击D.防止蒸汽过大对炉管有损伤
Mail order is a term which describes the buying of goods or services by mail delivery（邮递）. The buyer places an order for the desired products with the salesman through some remote method such as through a telephone call or a website. Then, the products are delivered to the customer. The products are typically delivered directly to an address supplied by the customer, such as a home address, but sometimes the orders are delivered to a nearby retail location for the customer to pick up. Some businessmen also allow the goods to be shipped directly to a third customer, which is an effective way to send a gift to an out\|of\|town friend. A mail order catalogue（目录）is a publication including a list of ordinary goods from a company. Companies who publish and operate mail order catalogues are treated as cataloguers within the industry. Goods are produced by people all over the world, such as in Australia, the USA, Canada, China etc. And now many cataloguers, just as with most retailers（零售商）, are increasingly buying goods from China.
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