[音频]By giving yourself limited time on your presentation, you are challenging yourself to leave out unnecessary details and focus on the important stories that will ________ your message.
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[音频]When designing your presentation, keep in mind that anything you show must be ________ to everybody in attendance and most audiences will be able to see text that are at least 30-size font.
抑制细菌的转肽酶，阻止肽聚糖交叉联接的药物是( )
A. 四环素
B. 环丝氨酸
C. 万古霉素
D. 杆菌肽
E. 青霉素
头孢菌素类药物的抗菌作用部位是
A. 细菌细胞壁
B. 细菌核糖体50s亚基
C. 细菌二氢叶酸还原酶
D. 细菌蛋白质合成移位酶
E. 细胞膜
下列哪一种头孢菌素属于第一代（）
A. 头孢呋辛
B. 头孢唑林
C. 头孢哌酮
D. 头孢曲松
E. 头孢匹罗
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