在HE切片上见到肺泡腔内有粉红色液体成分，可诊断为（）
A.肺出血
B.肺炎
C.肺水肿
D.肺羊水吸入
E.肺气肿
参考答案：C
— You didn't wait for Tom yesterday.
— Yes, but we ______. He didn't come.[ ]
A. needn't have
B. didn't need to
C. could have
D. should have
若分页系统的地址的结构如下图所示。
该系统页（1）字节，页号的取值范围为（2）。
空白（1）处应选择（）
A.1024
B.2048
C.4096
D.8192
