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【单选题】
下列关于刺激和反应的说法,哪项是错误的A.
有刺激必然产生反应
B.
产生反应时，必然接受了刺激
C.
阈刺激时，必然产生反应
D.
有刺激时，不一定产生反应
E.
有时反应会随着刺激强度加大而增强
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反馈参考答案：
举一反三
【简答题】These vaccines can ________specific responses
【简答题】刀具材料的常温硬度应在______以上。
【单选题】19
A.
Have talks with their families.
B.
Give them good extra benefits.
C.
Offer them expensive holiday tokens.
D.
Show appreciation to them face to face.
【单选题】Which one of the following statements describes an advantage of killed vaccines over attenuated live vaccines ?
A.
killed vaccines induce a broader range of immune responses than do attenuated live vaccines
B.
killed vaccines more closely mimic natural infections than do attenuated live vaccines
C.
killed vaccines pose no risk that vaccine might be transmitted to susceptible contacts
D.
killed vaccines are efficacious against respiratory infections because they induce good mucosal immunity
E.
none of the above is right
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