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【单选题】
用可见分光光度法测定某未知物的含量,当其浓度为c mol·L-1时,透光率为T,当其浓度由c变为0.5 c mol·L-1时,在同样测定条件下,其透光率应为( )。A.
T3/2
B.
T2
C.
T1/2
D.
T1/3
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举一反三
【简答题】组合体零件图上的尺寸应标注 、 和 三大尺寸。
【单选题】Please indicate the main function of the word that is in boldface in the following passage. More than one letter might be acceptable, but y ou must choose only one option as the best. From an advertis...
A.
P = a premise marker
B.
C = a conclusion marker
C.
A = an assuring term
D.
G = a guarding term
E.
D = a discounting term
F.
E+ = a positive evaluative term
G.
E- = a negative evaluative term
【简答题】Choose an acceptable verb form from the two given in brackets according to the standard of formal writing. 1.( ) 2.( ) 3.( ) 4.( ) 5.( ) 6.( ) 7.( ) 8.( ) 9.( ) 10.( ) 11.( ) 12.( ) 13.( ) 14.( ) 15.(...
【单选题】Choose an acceptable verb form from the two given in brackets according to the standard of formal writing : Pancakes and syrup (is, are) a tasty breakfast.
A.
is
B.
are
【单选题】下列几个命题：①圆既是轴对称图形，又是中心对称图形；②直径所对的圆周角是直角； ③在同圆中，相等的圆周角所对的弦相等；④在同圆中，相等的弦所对的圆周角相等； ⑤平分弦的直径垂直这条弦；⑥三点确定一个圆．其中正确命题是 [ ]
A.
①②③
B.
①②⑥
C.
①③⑤
D.
②④⑥
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