背书不得附条件，否则汇票无效。 ( )
参考答案：错
解析： 背书不得附条件，否则所附条件不具有汇票上的效力。
The place was flooded ________ it had been raining for several weeks.[ ]
A. because
B. because of
C. ever since
D. as a result of
支气管炎与支气管肺炎的主要区别点
A．气促
B．咳嗽
C．血常规
D．肺部干、湿罗音的部位、性质多变
E．发热
