单项选择题
下列关于过滤器的说法错误的是（ ）。
- A．过滤器按过滤效果分为高、中、低三档
B．过滤器以“台”为计算单位
C．非成品过滤器，其框架制作安装及除锈、刷油另行计算，以“Kg”为计算单位
D．过滤器以质量“t”为计算单位
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[填空1](2020年10月6日) Dear Sir/ Madam, I would like to make a reservation at your hotel. The party is composed of 2 persons. I’d like to[填空2] (预定) two single rooms with shower. We may[填空3] (入住) at about 3:00 p.m. on May 16th. And we will [填空4] (住8晚) – from the 16th to the 23rd. From the 17th to the 21st, we would need a conference room which is equipped with a computer and a projecting apparatus. Please send me a written confirmation of this reservation and a brochure of the price offer and the restaurant in your hotel by May 10th. My e-mail address is Amy@sina.com. [填空5] (你忠实的) , Amy
