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DL£¯T711£1999《汽轮机调节控制系统试验导则》中8.1.4.2机组甩负荷后,当转速飞升未达到危急保安器动作转速时,待甩负荷过程结束、测试工作结束后,速将转速降至3000r£¯min,进行哪些检查?
DL£¯T711£1999《汽轮机调节控制系统试验导则》中8.1.4.2机组甩负荷后,当转速飞升未达到危急保安器动作转速时,待甩负荷过程结束、测试工作结束后,速将转速降至3000r£¯min,进行哪些检查?
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In 1999, the government spent about $ 39 billion to ______.
A. improve the prison conditions
B. keep men and women in prison
C. build houses for prisoners
D. maintain the prisons