造成保险丝熔断的原因是（）
A、定子对地绝缘
B、定子绕阻间断路
C、绕组接线顺序一致
D、负荷过大
参考答案：D
46. With his own _____ Huang Jiguang, a fighting hero _____ the enemy's machine gun.
A．life; blocking
B．body; covered
C．body; blocked
D．body; stop
儿茶酚胺对运动的反应及适应？
