评级机构标准普尔昨天宣布将中国的主权信用评级展望从稳定调整为负面。
Standard and Poor's, the credit rating agency, has cut its outlook for China's sovereign credit ratings from stable to negative.
实际应用表明，系统在无人值守情况下可自行调整并稳定调压器输出电压，可满足电子加速器调压器的精确控制和自动控制要求。
It is shown in practice that the system can adjust the variac output voltage automatically and assure the accurate and automatic control of the electronic accelerator.
实际应用表明，系统在无人值守情况下可自行调整并稳定调压器输出电压，可满足电子加速器调压器的精确控制和自动控制要求。
It is shown in practice that the system can adjust the variac output voltage automatically and assure the accurate and automatic control of the electronic accelerator.
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