According to the cracking trouble of MDY-150 chainless haulage winning machine travel wheel's supporting base in working progress of working face, puts forward hanlding method.
针对采煤工作面生产过程中出现的采煤机行走轮支撑座开焊故障 ，对在无法直接焊接又难以拆装的情况下采取的简易方法进行了叙述。
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Even the Midcap SPDR (MDY) and the iShares Russell 2000 (IWM) fared far better than foreign indices.
FORBES: Glory Days For Energy, U.S. Stocks
If the market recovery sticks, expect the more volatile but far peppier MDY and IWM to outpace the big boys in the SPY.
FORBES: Earnings Derby: Alcoa Strikes Out, Google To The Plate, JPMorgan On Deck
Since 1999, the large cap SPY has produced a total return of less that 10%, while the SPDR Midcap 400 (MDY) is up 100%.
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