馈线在室外部分的外防护层应有不少于()的外防护层接地连接。
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Early indications of the approach of a hurricane may be all of the following EXCEPT().
A. short confused swells
B. gradually increasing white clouds (mare's tails)
C. pumping barometer
D. continuous fine mist-like rai
心肌梗死最常发生的部位在()
A. 右心室后壁
B. 右心室前壁
C. 左心室后壁
D. 左心室前壁
E. 左心室侧壁