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【简答题】
若子类和父类不在同一个包中,则子类继承了父类中的______和______成员,将其作为子类的成员,但不能继承父类的______和______成员(按从宽到窄的顺序填空)。
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【简答题】世界公认的的五大投资金币为,()的鹰洋金币,中国的()金币,()的克鲁格金币,澳大利亚的()金币以及()的枫叶金币
【多选题】棱锥表面上的点的投影,可以采用 来求解。
A.
积聚性
B.
辅助线
C.
辅助平面
D.
辅助圆
【多选题】棱锥表面上的点的投影,可以采用 来求解。
A.
积聚性
B.
辅助素线
C.
辅助平面
D.
辅助圆
【单选题】— How long has your brother been working in this factory? —     he graduated from college.
A.
When
B.
By the time
C.
Until
D.
Ever since
【单选题】How long has your daughter been missing? ().
A.
I miss my daughter a lot.
B.
We haven't seen each other for two months.
C.
About half an hour. I've been looking for her everywhere.
【简答题】圆锥表面上点的投影,可以采用_________和___________两种方法求取。
【单选题】--- How long has your brother the computer? --- About two weeks.
A.
bought
B.
had
C.
received
D.
borrowed
【简答题】圆锥表面上点的投影,可以采用_________和___________两种方法求取。
【单选题】How long has your brother ___ the army?
A.
joined
B.
taken part in
C.
been
D.
served in
【单选题】燃烧器的点火棒、指示灯、喷嘴、稳焰器、滤油器和油泵过滤器应()清洗一次。(单选题)
A.
每周
B.
每月
C.
每季度
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