支气管哮喘发作时肺部典型体征是()
A.干湿啰音同时存在
B.两肺密布哮鸣音
C.两肺密布湿性啰音
D.两肺可听到支气管呼吸音
E.两肺语颤增强
参考答案:B
— Why is Mr. Li so happy this morning?
— Because he was honoured with a(n)______ for excellence in teaching. [ ]
A. present
B. gift
C. award
D. reward
局域网的数据链路层划分为()和逻辑链路控制(LLC)两个子层。