潮区界以下受潮汐影响的河段称为()
A、过渡段
B、喇叭型河口
C、三角洲河口
D、感潮河段
参考答案:D
You that late last night. It was harmful to your health. [ ]
A. mustn't have worked
B. shouldn't have worked
C. can't have worked
D. mightn't have worked
气管支气管管壁的结构功能