商标全面注册原则
参考答案：是指在经济活动中使用的商标，都必须申请商标注册，未经注册的商标禁止使用。
泵吸人口气液比界限为多少？
_________ he stayed in Germany for half a year and he will go to Germany _________again.
A．Before long; before long
B．Long before; long before
C．Before long; long before
D．Long before; before long
