The no machining directional solidification hollow turbine blades, hollow guide vans and complex structure parts used in aero engine and gas turbine made by vacuum precision investment casting.
Function and working principle of a gate watching dog of a guide circuit and a kind of a guide gate watching dog are presented for an intelligent vacuum circuit breaker in coal mine.
介绍了用于煤矿井下智能型真空磁力起动器中的先导电路看门狗的功能及工作原理和一种先导看门狗电路。
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To sum up, this paper studies the settlement calculation and forecast of soft soil subgrade by vacuum preloading and obtains some useful conclusions which can guide construction better.