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学太极拳为什么要提倡科学的学练,而反对唯心和行而上学?

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爆炸性气体按最大试验安全间隙和最小点燃电流比分()级。

A
B
C
D

1951年10月,()和平解放,实现了祖国大陆的大统一和大团结。

Water accumulation in the cylinder of a secured engine is an indication that the ()

A. soft water pump was not secured along with the engine
B. jacket water thermostat has failed
C. cylinder liner may be cracked
D. raw water pump is over-speeding just prior to engine shutdow

CTCS-2级列控系统车站入口处的有源应答器的信息丢失时,机车NBP为()km/h。

A. 45
B. 50
C. 55
D. 80

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