电子秤属于国家强检计量设备，每年都要定期检验。
参考答案：对
A．CaCO3⇌Ca2++CO32-
B．H2CO3⇌2H++CO32-
C．NH3•H2O⇌NH3+H2O
D．H2SO3⇌H++HSO3-
—I often have hamburgers for lunch.
— You’d better. It’s bad for you ______ too much junk food.
A．eat
B．to eat
C．eating
D．ate
