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Fill in the blanks with the words given below. Change the form where necessary. Each word can be used only once.divorceanonymousembarkportrayrejuvenationnoteworthydomainafflictcherishdepriveAudrey Hepburn began her permanent ambassadorship in 1988 and ________ on trips to many countries.

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A. [Al(H2O)6]3+
B. [Cr(H2O)6]3+
C. HCO3-
D. PO43-

A. 同一物质不能同时作为酸和碱;
B. 任何一种酸,得到质子后变成碱;
C. 酸不能是阳离子;
D. 碱可能是电中性的物质。

A. PbCrO4首先沉淀。当PbCrO4沉淀完全后,PbSO4才沉淀;
B. PbSO4先沉淀,然后PbSO4和PbCrO4共沉淀;
C. PbSO4和PbCrO4共沉淀;
D. PbSO4先沉淀,后转变为PbCrO4沉淀。