২৪৭৫৫
In database management a "primary key" must be
উত্তর
Unique and cannot contain null values.
২৪৭৫৭
Change the voice- 'The parcel contains important materials.'
উত্তর
Important materials are contained in the parcel.
২৪৭৫৮
Choose the correct words to complete the sentence. Last night I came to my house and found that the door-
উত্তর
had been broken