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【单选题】
用Na2CO3(M=106.0)标定0.1 mol·L-1HCl溶液时，欲使滴定所消耗HCl溶液的体积控制在25 mL左右，取Na2CO3的质量约为（）
A.
0.13g
B.
0.16g
C.
0.19g
D.
0.21g
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【单选题】Now that she is out of a job, Lucy ______going back to school, but she hasn’t decided yet.
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