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矿井井下供电总接地网的接地电阻应小于（）Ω。
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调车模式（SH）：牵引运行时，限制速度为（）。
真空灭弧室主要由绝缘外壳、屏蔽罩、（）及动静触头等组成。
You are a system administrator at Company. The network includes 100 Windows 2000 Professional computers. A user named Peter wants to share a local printing device directly connected to his computer. Peter needs to share this device among three groups: Engineering, Accounting, and Operations. Peter wants to delegate printer administration to one print administrator from each group. Each print administrator must be able to delete print jobs generated by their own group on the print device. They should not be able to delete print jobs from other groups. You want to configure Peter’s client computer to support these requirements. What should you do? （）
患者男，45岁，因“颈部包块伴声音嘶哑1个月”来诊。曾有阵发性面潮红。既往史无特殊，家族中无甲状腺疾病和肿瘤史。查体：P96次/min，BP150/100mmHg；声音嘶哑；颈部明显增粗，甲状腺Ⅲ度肿大，左侧直径4cm结节，质地硬，活动度差；双侧淋巴结肿大。（提示：检查结果显示甲状腺功能正常，TgAb200U/L（正常值＜150U/L），TPOAb20U/L（正常值＜35U/L），血清降钙素300pg/ml（正常值＜10pg/ml），甲状腺B超发现甲状腺左叶有4.5cm×5.0cm低回声结节，伴粗大钙化点，直径0.2cm，右侧2个低回声结节，直径分别为0.8cm×0.7cm和0.3cm×0.2cm。声带检查发现左侧声带运动障碍。）为除外MEN2A还需要做的检查是（提示：患者入院期间，监测血压发现持续性高血压，150~160mmHg。）（）。
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