男性，40岁。近半年来经常出现阵发性心慌伴明显饥饿感，发作严重时出冷汗，多在餐前及凌晨发生，进餐后好转。平时多睡，体重增加。

下列哪项检查对诊断最有帮助（）。

A.心电图

B.电解质

C.发作时血糖

D.脑CT

E.发作时尿糖

If not attached to the nozzle,each low-velocity spray applicator on a vessel must be stowed（）.

A.in a protected area on the main deck

B.inside a machinery space near the entrance

C.next to the fire hydrant to which the fire hose is attached

D.on a rack inside the quarters near the entrance