光的发送和接收可在同一根光纤中进行。
参考答案：对
—Your parents are taking walks in the park.
—Yes. They are so____.[ ]
A. relaxed
B. relaxing
C. surprised
D. surprising
《金匮要略》云："其脉自沉，外证腹满不喘"指的是：
A．正水
B．石水
C．阴水
D．鼓胀
E．皮水
