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Self-excited a-cgenerator with "error operated" voltage control systems draw the full excitation power for the machine terminalsThis dispenses with the current transformers, reactors and capacitors necessary for accurate compounding, but renders the excitation system vulnerable to variations in its output voltageWhich of the following is correct about the generator mentioned according to the sentences above ().
简述乙肝疫苗接种时间。
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医用氧气的质量标准应达到以下要求()
如何树立正确的人生观?()
可用于治疗感染中毒性休克的药物是()
"喜润恶燥"的脏腑是()
如果游客在炎炎夏日被晒伤,症状较重的要及时送往医院,在医生的指导下进行治疗。()
女,34岁。因突起腹中部疼痛伴血便2天入院。腹痛为阵发性,伴恶心、呕吐,为胃内容物。起病后曾解黏液血便3次。查体:消瘦、贫血貌,腹稍胀,全腹软,下腹正中可扪及8cm×6cm肿块,质中,轻压痛,上下可以推动,肠鸣音活跃,音调稍高。下列处理,哪项较为妥当()
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