腺病毒肺炎的临床特点应除外
A．起病急呈稽留高热
B．肺部体征出现较晚
C．早期有全身中毒症状
D．并发渗出性胸膜炎
E．易发生皮下及纵隔气肿
参考答案：B
真空中有两个点电荷，他们的电荷量分别为-2Q和+4Q，若它们相r时的静电力为F，则把它们接触后分开再放到相距2r处，它们间的静电力为（ ）
A．F/4
B．F/8
C．F/16
D．F/32
_______ the fact that Friday was always their busiest day, the girl seemed to be enjoying herself.[ ]
A. Despite
B. Due to
C. Besides
D. If only
