已知am=4,an=16,那么a m+n的值为( ).
64
Since the baby milk powder was found to be polluted, there has been universal doubt _____ other food products are safe _____.
A.that; to eat
B.whether; to be eaten
C.whether; to eat
D.that; to be eaten
有关甲亢性心脏病,下列说法正确的是()
A.可以发生在长期患严重甲亢的青年患者
B.多发生在老年患者
C.主要表现为心房颤动和心力衰竭
D.主要表现为室性早博
E.主要表现为心动过速