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【单选题】
To add selenium by taking pills are probably not effective because ______.A.
the human body is not in the right chemical form
B.
the human body does not accept it
C.
the selenium is, not in the right chemical form. to be absorbed
D.
the selenium is difficult to absorb
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【单选题】Before starting university, you'd better choose a course,_________ best reflecting your interest and strength.
A.
one
B.
the one
C.
that
D.
which
【简答题】Writing You should spend about 40 minutes on this task. Write about the following topic: In some countries young people are encouraged to work or travel for a year between finishing high school an...
【单选题】28 Before starting university, you'd better choose a course, ________ best reflecting your interest and strength.
A.
one
B.
the one
C.
that
D.
which
【单选题】波长为500nm的绿光投射在间距为0.022 cm的双缝上,在距离为180 cm处的光屏上形成干涉条纹,两个相邻亮条纹之间的距离是( )
A.
3.08mm
B.
4.0mm
C.
4.09mm
D.
5.0mm
【简答题】承受静力荷载时，当焊件的宽度不同或厚度相差4mm以上时，在对接焊缝的拼接处，应分别在焊缝的宽度方向或厚度方向做成坡度不大于[填空(1)] 的斜角。
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