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【单选题】
下列关于包的描述中,错误的是()
A.
一种特殊的类
B.
若干个类的集合
C.
使用 package 语句创建的
D.
有无名包两种
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【简答题】简述教育研究的基本原则?
【简答题】简述教育研究的基本原则。
【单选题】Not until we have had a chance to discuss it thoroughly ________ perfectly.
A.
the problem has been settled
B.
has the problem been settled
C.
will the problem be settled
D.
the problem was settled
【单选题】离心泵输油时流量和扬程正常,电动机电流过大,不会是因为 。
A.
电压过低
B.
填料太紧
C.
叶轮碰擦泵壳
D.
油粘度太大
【简答题】简述教育研究的基本原则
【单选题】We had to be patient because it___some time ___we got the full results.
A.
has been ; since
B.
had been ; until
C.
was; after
D.
would be ; before
【单选题】Only after we left the building ______ how dangerous the situation had been.A.was I realizedB.I
A.
26. Only after we left the building ______ how dangerous the situation had been. A.was I realized
B.
I realized
C.
did I realize
D.
I was realized
【简答题】简述教育研究的基本原则,并举例说明。
【单选题】60海里以下飞机航向的保持,是由哪个通道的控制()
A.
横滚通道(ROLL)
B.
俯仰通道(PITCH)
C.
航向通道(YAW)
D.
总矩通道(COLLETIVE.
【简答题】简述教育研究的基本原则?
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