启动初期汽包水位为何以云母水位计和电接点水位计为准？
国家经济贸易委员会在2001年以第30号文颁布了一个审核规范，这个审核规范的名称是。（） ["职业安全生产管理体系审核规范","职业安全环保管理体系审核规范","职业安全健康管理体系审核规范"]
普通铸铁力学性能的好坏，主要取决于（） ["基体组织类型","热处理的情况","石墨的形状、大小与分布","石墨化程度"]
田园城市理论是什么？
Wise buying is a positive way in which you can make your money go further. The （）you go about purchasing an article or a service can actually （）you money or can add （）the cost.
Take the （）example of a hairdryer. If you are buying a hairdryer, you might （）that you are making the （）buy if you choose one （）look you like and which is also the cheapest （）price. But when you get it home you may find that it （）twice as long as a more expensive （）to dry your hair. The cost of the electricity plus the cost of your time could well （）your hairdryer the most expensive one of all.
So what principles should you （）when you go out shopping?
If you （）your home, your car or any valuable （）in excellent condition, you’ll be saving money in the long （）
Before you buy a new （）,talk to someone who owns one. If you can, use it or borrow it to check it suits your particular （）
Before you buy an expensive （）,or a service, do check the price and （）is on offer. If possible, choose （）three items or three estimates.
请在第（）处填上正确答案。 ["of","in","by","from"]
锅炉启动前通风吹扫的目的是什么？
