There were lobectomy in 10 cases, lung wedge resection in 3, excision of intraluminal tumor of bronchus in 3, exploratory thoracotomy in 2. Results: No operative death.
施行肺叶切除10例，楔形切除3例，支气管腔内肿瘤摘除3例，开胸探查2例，无手术死亡或住院死亡。
The result mean: the cutting force affected more by species, cutting direction, the size of saw blade, Angle parameter and the depth of cutting when making no dust cutting experiment by wedge saw.
研究证明，楔型刀锯进行木质材料无屑切削时，其切削力受木材的树种、切削方向、锯片尺寸、角度参数及切削用量的影响较大。
The geological condition is complicated and varies often. Using the method of pre-support through hammering wedge, the cave mouth digging work of No. 640 main transportation channel was successful.
简述了板石矿业公司上青矿640主运输平巷在硐口段施工过程中，克服地质条件复杂、多变的现状，采用撞楔超前支架法施工，硐口掘凿获得成功。
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