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we can construct a full adder with two half adders.（）

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My favorite dish is sweet and sour pork.（）

用系统命名法命名下列化合物用系统命名法命名下列化合物

There are two levels of web portals identified in the passage: information and communication.There are two levels of web portals identified in the passage: information and communication.

Homonymy refers to the phenomenon that words having different meanings have the same form, i.e. different words are identical in sound or spelling, or in both.（）