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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.divorceanonymousembarkportrayrejuvenationnoteworthydomainafflictcherishdepriveThe results of the survey are _______ and useful despite being from a small sample.

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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.

Fill in the blanks with the words given below. Change the form where necessary. Each word can be used only once.divorceanonymousembarkportrayrejuvenationnoteworthydomainafflictcherishdepriveThe director said that they needed a young actress who could ________ someone who was both unbalanced and confident at the same time.

按照酸碱质子理论,下列哪一种物质既可作为酸又可作为碱

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

根据酸碱质子理论,下面正确的是

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。