The strengthening method of digging groove and increasing hidden beam is proposed by combining an actual project, which avoids all of demolition and restitution.

结合实际工程，提出了开槽设暗梁的楼板加固方法，避免了全部拆除重建。

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The hidden corbel is the vital supporting member in the dry beam-column connections in full precast concrete frame.

在全预钢筋制混凝土框架梁柱干式暗牛腿节点中，钢筋混凝土暗牛腿是重要的竖向传力构件。

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A hidden danger in the high voltage power supply of the ELA-120/6 electron beam welding machine is found, countermeasures to remove the danger are discussed and an ameliorated sample is made.

分析了EAL-120/6型电子束焊机高压电源存在的安全隐患，提出了消除隐患的措施，给出一种改进实例。

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