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【单选题】
图层作带有标准卡片的XRD图像时,以下哪一项是必须的:A.
各图层中纵坐标范围一致
B.
各图层中横坐标范围一致
C.
各图层中刻度间隔一致
D.
各图层中图形边框一致
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反馈参考答案：
举一反三
【单选题】本实验终点颜色变化为 浅绿色 变为紫色或紫蓝色,绿色颜色是( )呈现颜色。
A.
指示剂氧化型颜色
B.
指示剂还原型颜色
C.
Cr 3 ＋ 离子颜色
D.
Fe 3 ＋ 离子颜色
【单选题】—Can I help you,sir? —___________.
A.
Yes,you can
B.
No,I don’t buy anything
C.
Of course,if you like
D.
No,thanks.I’m being served
【单选题】— Can I help you, Madam? — _____. [ ]
A.
Yes, you can
B.
No, I don't need anything
C.
Of course, if you like
D.
No, thanks. I am being served
【单选题】Sometimes we just believe what we see, the reality may be different.
A.
even though
B.
as if
C.
since
D.
unless
【简答题】Direction: Complete the sentence with a proper word on P. 42 of your textbook. Change the word form if necessary. The information in the brackets can help you to decide what kind of word you should ch...
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