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【单选题】
关于预防接种的时间,哪项是正确
A.
2个月时开始接种脊髓灰质炎疫苗
B.
2个月后接种卡介苗
C.
4～5个月时接种麻疹疫苗
D.
6～8个月时接种乙型脑炎疫苗
E.
1岁后开始接种百白破混合疫苗
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【简答题】根据课文内容完成下面短文(注意括号中的提示)。 At the end of the 16th century, English was only spoken by people in England. They were native English speakers. However, 1______ English language has changed quite a lot over ...
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【单选题】According to this passage, _________.
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English is a sexist language
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only in the scientific world is the role of women increasing rapidly
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male nouns or pronouns should not be used to refer to scientists
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【简答题】有A、B、C、D、E、F、G、H、I九种常见物质，它们的转化关系（反应条件未注明）如图所示。其中B、C、D为单质，常温下D为固态，B、C、E、G为气态，F为淡黄色粉末，I的焰色反应为黄色。 请回答： （1）写出F的电子式_________ ，其化学键类型有__________ 。 （2）写出反应⑤的化学方程式_____________________________。 （3）I的是溶液呈____性...
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【简答题】根据课文内容完成下面短文(注意括号中的提示)。 At the end of the 16th century, English was only spoken by people in England. They were native English speakers. However, 1______ English language has changed quite a lot over ...
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