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【单选题】
直流稳压电源中滤波电路的作用是A.
将交流变为直流
B.
将高频变为低频
C.
将交、直流混合量中的交流成分滤掉
D.
将交、直流混合量中的直流成分滤掉
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反馈参考答案：
举一反三
【单选题】—Do you think grandpa and grandma late? —No,the train is usually on time.
A.
were
B.
will be
C.
was
D.
have been
【单选题】My grandpa and grandma are teachers. They both like _____ students.
A.
her
B.
his
C.
theirs
D.
their
【简答题】变应性鼻炎属（）型变态反应，分为（）变应性鼻炎和（）变应性鼻炎两种类型。
【判断题】_____ 1. Grandpa and Grandma had a lovely talk while the sun was setting.
A.
正确
B.
错误
【简答题】阅读短文，判断正(T)误(F)。 Hi! I'm Mike. My grandpa and grandma are teachers. My father is a driver. He's strong. He likes music. My mother is a doctor. She is thin. My brother is a doctor, too. He is strong. H...
【判断题】Popcorn ( ) Once my grandpa and grandma brought popcorn to my house and we enjoyed the snack over my grandpa’s stories.
A.
正确
B.
错误
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