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问题 单项选择题

健康男婴，年龄3个月，来门诊接受预防接种，他应当接种的是( )。

A．卡介苗
B．百白破第一次
C．脊髓灰质炎疫苗第一次
D．麻疹疫苗第一次
E．乙肝疫苗第二次

答案

参考答案：B

解析：[知识点] 计划免疫

改错题

短文改错。

     Hello, everyone. Now I will show you on my home town.     1.__________

Sunshine town is a new town in Beijing. It is very beautiful. But

it is far from the city. It's takes 20 minutes to get to the nearest   2.__________

town. Because cars can go into the center of the town, there is   3.__________

less air pollution in our town than

in other areas in Beijing. Most of us live in tall building.               4.__________

We love to live in buildings because we can be close to our

friends. If we have any questions, we can go to our friends' to    5.__________

help.

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选择题

设NA表示阿伏加德罗常数的值，下列说法正确的是（　　）

A．4.6gNO2和N2O4中含有的原子数为0.3NA

B．1L0.1mol/L的硫酸铜溶液中含铜离子数为0.1NA

C．0.1mol18O原子中含有的中子数为0.9NA

D．33.6L氯气与足量的铁充分反应，转移的电子数为3NA
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