21．預(yù)防支氣管哮喘發(fā)作宜選用(      )

A．麻黃堿                                                    B.異丙腎上腺素

C.腎上腺素                                                   D.阿托品

22．肝素抗凝作用的主要機制是(      )

A．直接滅活凝血因子                                   B.激活抗凝血酶Ⅲ

C.抑制肝合成凝血因子                                  D.激活纖溶酶原

23．阻斷胃壁細(xì)胞H⁺泵的抗消化性潰瘍藥是(      )

A．奧美拉唑                                                 B.米索前列醇

C.哌侖西平                                                   D.丙谷胺

24．H₁受體阻斷藥無效的疾病是(      )

A．蕁麻疹                                                    B.暈動病

C.十二指腸潰瘍病                                         D.失眠

25．氯化銨是(      )

A．外周性鎮(zhèn)咳藥                                          B.稀釋痰液性祛痰藥

C.粘痰溶解性祛痰藥                                     D.抗酸藥

26．青霉素的主要不良反應(yīng)是(      )

A．白細(xì)胞減少                                             B.肝功能損傷

C.過敏性休克                                                D.腎毒性

27．下列頭孢菌素中抗綠膿桿菌作用最強的是(      )

A．頭孢哌酮                                                 B.頭孢他啶

C.頭孢曲松                                                   D.頭孢孟多

28．下列組合中不宜聯(lián)合用藥的一組是(      )

A．SMZ和TMP                                            B.慶大霉素和呋塞米

C.青霉素G和破傷風(fēng)抗毒素                          D.異煙肼和乙胺丁醇

29．最易引起過敏性休克的氨基糖苷類是(      )

A．慶大霉素                                                 B.阿米卡星

C.鏈霉素                                                       D.卡那霉素

30．阿奇霉素屬于(      )

A．大環(huán)內(nèi)酯類抗生素                                   B.頭霉素類抗生素

C.頭孢菌素類抗生素                                     D.β-內(nèi)酰胺酶抑制藥