题目内容

A:UPDATE Teacher SET职称="助教"WHERE职称="讲师"
B:UPDATE Teacher SET职称="讲师"WHERE职称="助教"
C:UPDATE SET职称="助教"WHERE职称="讲师"FROMTeacher
D:UPDATE SET职称="讲师"WHERE职称="助教"FROMTeacher

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收尘极系统的功能是_____________,并在______作用下使收尘极板表面附着的粉尘成片状脱离板面,落入灰斗中,达到除尘的目的。

A:INSERT INTO Teacher(编号,职称)VALUES("070041","助教")
B:INSERT INTO Teacher("070041","助教")VALUES(编号,职称)
C:INSERT INTO VALUES(编号,职称)Teacher("070041","助教")
D:INSERT INTO VALUES("070041","助教")Teacher(编号,职称

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