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【单选题】
下列属于醇官能团的是A.
-NH 2
B.
-COOH
C.
-OH
D.
-CHO
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皮皮学刷刷变学霸
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【单选题】I don't think ______necessary for Julie to make such a fuss about that sort of thing.
A.
her
B.
it
C.
that
D.
this
【简答题】标出一组平行线． ______组平行线______组平行线．
【简答题】一闪耀光栅刻线数为100条/mm，用λ=600nm的单色平行光垂直入射到光栅平面，若第2级光谱闪耀，闪耀角应为多大?
【简答题】一闪耀光栅刻线数为100条／mm，用λ=600 nm的单色平行光垂直入射到光栅平面，若第二级光谱闪耀，闪耀角应为多大?
【单选题】According to the section "Source Of Frustration," how does Julie Seaver think that schools should handle the graduation gown issue?
A.
Seaver thinks it would be best to allow students to choose from two colors.
B.
Seaver thinks it would relieve stress for students if graduation gowns didn't exist.
C.
Seaver thinks it would be best to have just one color for the graduation gowns.
D.
Seaver thinks it would relieve stress for students if the schools stuck with tradition.
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