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【判断题】
我国铁路规定正线区间道床边坡坡度均为1:1.75。A.
正确
B.
错误
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【单选题】根据量子力学原理，当氢原子中电子的轨道角动量【图片】时，【图片】在外磁场方向上的投影【图片】可取的值分别为（ ）。
A.
和
B.
0、 和
C.
0、 和
D.
在[ , ]之间可连续取值
【简答题】It sounds interestin g, but I (更情愿) stay at home
【单选题】According to Oberg, people go through four stages when
A.
their new experience is interesting and entertaining.
B.
they have to adapt to new and unfamiliar situations.
C.
the customs of the new situation are negative.
D.
their new spouse is very different from their perception.
【单选题】At the end of the nineteenth century, a rising interest in Native American customs and an increasing desire to understand Native American culture prompted ethnolo- gists to begin recording the life st...
A.
The historical backgrounds of two currently used research methods are chronicled.
B.
The validity of the data collected by using two different research methods is compared.
C.
The usefulness of a research method is questioned and then a new method is proposed.
D.
The use of a research method is described and the limitations of the results obtained are discussed.
E.
A research method is evaluated and the changes necessary for its adaptation to other subject areas are discussed.
相关题目：
【单选题】根据量子力学原理，当氢原子中电子的轨道角动量【图片】时，【图片】在外磁场方向上的投影【图片】可取的值分别为（ ）。
A.
和
B.
0、 和
C.
0、 和
D.
在[ , ]之间可连续取值
参考解析：
知识点：
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