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血压计属于（）仪器设备。

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维生素D缺乏性手足搐搦症的主要表现是（）

A. 惊厥
B. 昏迷
C. 手足徐动
D. 高热
E. 肌阵挛

Which two encapsulation methods require that an 827 ADSL router be configured with a PPPusername and CHAP password？（）

A. PPPoE with the 827 configured as a bridge
B. PPPoE with the 827 configured as the PPPoE client
C. PPPoA
D. RFC 1483 Bridged with the 827 configured as the PPPoE client
E. RFC 1482 Bridged with the 827 configured as a bridge

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防止直接雷击和感应雷击有哪些措施？

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斗轮机电铃不响的原因？

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