某机电安装工程公司承担了一项小型工业的建筑管道工程任务。在施工现场应具有必要的施工技术标准，按照规定的施工程序施工，其工程内容包括：室内给水系统。室内排水系统，室内热水供应系统，卫生器具安装，室内采暖系统，室外给水、排水、供热管网等。
阀门安装前，应作强度和严密性试验，试验应在每批数量中抽查（），且不少于一个。
A．10%
B．15%
C．20%
D．30%
参考答案：A
The Slender West Lake Scenic Spot lies in the northwestern part of Yangzhou, with its south gate facing Great Rainbow Bridge Road. It covers an area of about 123.6 hectares. The Slender West Lake was named a National Key Scenic Spot in 1988 and National AAAAA Tourist Area in 2010.  The Slender West Lake used to be a long river named the Baozhang Lake, which is 4 kilometers in length and less than 100 meters in width. A famous poet Wang Hang in the Qing Dynasty once composed a poem (诗歌), from which the Slender West Lake gets its present name and to which it owes its great fame (名声) both at home and abroad. During the Sui and Tang Dynasties, many gardens were built along the Slender West Lake. Following the lines of the natural landscape, a large number of buildings along the moats(护城河) were constructed(建造) in different locations during different periods. Emperors Kangxi and Qianlong of the Qing Dynasty both visited the Slender West Lake. The Slender West Lake Scenic Spot is an outstanding representative (代表) of the lake gardens in China. In a word, the Slender West Lake not only represents the beauty of natural landscape（风景）, but also embodies (体现) the richness of its history and culture. The Slender West Lake
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