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【简答题】
物质燃烧过程的发生和发展，必须具备以下三个必要条件，即：（）、助燃物和（）。
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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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