In order to ________ his dream, the boy has been studying very hard.
A. realization
B. realize
C. really
D. real
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There are only a few ________ from the air crash.
A. survive
B. survivors
C. survival
D. survivor
集散控制系统机柜的安装要求与常规仪表箱安装要求相比,前者安装要求()。
对运行中的联锁保护系统进行维修时,应注意哪些问题?