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【简答题】
公民的国防义务包括哪一些?
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反馈参考答案：
举一反三
【单选题】I had just started back for the house to change my clothes ________I heard voices.
A.
as
B.
when
C.
after
D.
while
【简答题】I had just started back for the house to change my clothes I heard voices．
【单选题】It’s years since I _______ him last time, and I haven’t written back to him.
A.
heard of
B.
heard out
C.
heard about
D.
heard from
【单选题】下列表达式成立的是
A.
parseInt(12.5)==parseFloat(12.5)
B.
Number("123abc")==parseFloat("123abc")
C.
isNaN("abc")==NaN
D.
typeof NaN=="number"
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