Beijing Long Run Da Electronics Co., Ltd. is a professionalinstrument suppliers.
北京宝云兴业科贸有限公司，是从事环境检测仪器的专业公司。
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(V/O)Today y's professionalinstrument makers succeed in making a set of ten-hole Xun Ocarinas and thus make up for its small volume range.
今天， 虀新一代乐器制作家成功地做出了一套十孔的埙， 弥补了古埙音域狭窄的缺点。
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This paper describes the designation of a measuring instrument of the angle of the inclined hole, and develops a professionalinstrument which is low-cost, highly-practical and has a high precision.