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【单选题】
滴定分析的相对误差一般情况下在A.
0.02%以下
B.
0.2%以下
C.
0.3%以下
D.
0.2%～0.3%之间
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举一反三
【简答题】竖式计算（除不尽的保留两位小数） 19.19÷0.95 56.29÷6.1 23÷33 7.41÷0.57 21÷240 3.85÷0.76．
【单选题】The main purpose of the text is to______.
A.
convince the reader that vaccines are not as safe as many think
B.
educate the reader on how vaccines are used and some of their dangers
C.
educate the reader on the circumstances that would neccesitate widespread vaccinations
D.
present the method by which vaccines are used through the case of the smallpox vaccine
【简答题】These vaccines can ________specific responses
【简答题】写出下列反应式： (1) (2) (3) (4) (5)
【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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