用磁电式电流表测量直流大电流、扩大量程的方法是()。
A. 外附分流器
B. 串联电阻
C. 应用互感器
D. 混联电阻器
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You are the Cisco Network Designer in Cisco.com. In your company site, a NAS is both physicall yand logically in the traffic path. The NAS identifies clients solely based on their MAC addresses. Inwhich access mode has this NAS been configured to operate?()
A. Layer 2 mode
B. Layer 2 Edge mode
C. Layer 3 mode
D. Layer 3 In-Band mode
男性,58岁。血压:162.6/109.9mmHg。经病史、常规体检及有关检查排除了继发性高血压。无心、脑、肾的并发症,无糖尿病、甲亢等合并症。服用美托洛尔1周后血压降至正常。但患者出现心动过缓、传导减慢等症状,这可能是美托洛尔阻断心脏哪种受体所致()
A. α2受体
B. β2受体
C. α1受体
D. β1受体
E. M受体
"待业"与"失业"两个概念含义相同。()
A. 正确
B. 错误