21．研究细菌的生物学性状,最好选用细菌生长繁殖的哪个时期(      )

A．迟缓期                                                       B.对数生长期     

C.稳定期                                                         D.衰退期

22．病原菌侵入血流并在其中繁殖,造成机体严重损害出现全身中毒症状称(      )

A．毒血症                                                       B.菌血症     

C.败血症                                                         D.脓毒血症

23．关于细菌核蛋白体的叙述，哪一项是错误的(      )

A．沉降系数为70S                                          B.由30S和40S两个亚基组成

C.链霉素能与30S亚基结合                              D.红霉素能与50S亚基结合

24．能区别甲型溶血性链球菌与肺炎链球菌的试验是(      )

A．外斐试验                                                   B.胆汁溶菌试验

C.OT试验                                                        D.肥达试验

25．当一工人因铁钉深刺造成外伤送医院急症时，医生首先考虑给予注射(      )

A．破伤风类毒素                                            B.破伤风抗毒素

C.百白破三联疫苗                                           D.丙种球蛋白

26．培养结核杆菌选用(      )

A．吕氏血清培养基                                         B.罗氏培养基

C.巧克力培养基                                               D.庖肉培养基

27．判断有包膜与无包膜病毒的依据是(      )

A．是否出现细胞病变                                     B.对脂溶剂是否敏感

C.超速离心沉淀速度不同                                 D.对温度抵抗力不同

28．怀孕期受感染引起畸胎的病毒主要是(      )

A．流感病毒                                                   B.脊髓灰质炎病毒

C.风疹病毒                                                      D.冠状病毒

29．杀灭细菌芽孢最有效的方法是(      )

A．紫外线照射                                                B.煮沸法

C.高压蒸汽法                                                  D.间歇灭菌法

30．内基小体可用于辅助诊断的疾病是(      )

A．鹦鹉热                                                       B.麻疹

C.狂犬病                                                         D.疱疹