下列表述中,()不属于要约必须具备的条件。
A.要约必须是特定人所为的意思表示
B.要约必须向第三人发出
C.要约的内容应当具体确定
D.要约必须具有缔约目的
参考答案:B
A lot of people were made tired of the lecture which ________as long as four hours.
A.kept
B.went on
C.continued
D.lasted
气管切开术后最常见的并发症是()
A.出血
B.气胸
C.皮下气肿
D.纵隔气肿
E.拔管困难