______is generally defined as the study of meaning and usually pays attention to the study of meaning of linguistic units themselves, words and sentences in particular, which has always been a central topic in human scholarship.
A.
Phonetics
B.
Connotation
C.
Sense
D.
Semantics
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【单选题】1mol·L - 1 HCl 与 0.1mol·L - 1 H 3 BO 3 混合液,今欲测定其中 HCl 含量,用约 0.1mol·L - 1 NaOH 标准溶液滴定,应选 ( ) 作指示剂。 H 3 BO 3 的 K a =5.8 ́ 10 - 10