干啰音形成与哪种情况无关()
A.呼吸道痉挛
B.呼吸道狭窄
C.肺块压迫气管
D.血性分泌物存在
E.呼吸道部分阻塞
参考答案:C
When we put the suggestion to him, he thought highly of it and was ______ about its immediate application.
A.curious
B.content
C.cautious
D.enthusiastic
盐酸美他环素含量测定方法()
A.荧光法
B.气相色谱法
C.四氮唑比色法
D.高效液相色谱法
E.汞量法