Daniel_Widjaja wrote:Twenty-two feet long and 10 feet in diameter, the AM-1 is one of the many new satellites that is a part of 15 years effort of subjecting the interactions of Earth's atmosphere, oceans, and land surfaces to detailed scrutiny from space.

the answer shows the construction "...is one of the many new satellites that ARE..."

For regular one of Xs constructions, it should be followed by a singular verb right?

She is one of the girls that/who are in the high school.

In the above statement, "She" is the object of the group "girls". If the Group is followed by That/Who then the immediate verb will take Plural form.

General: Y is one of the Xs THAT/WHO Plural Verb .

She is one of the girls eats Burger.

If the Group is not followed by THAT or WHO then the verb will take singular form.

General: Y is one of the Xs Singular Verb .

Daniel_Widjaja wrote:Twenty-two feet long and 10 feet in diameter, the AM-1 is one of the many new satellites that is a part of 15 years effort of subjecting the interactions of Earth's atmosphere, oceans, and land surfaces to detailed scrutiny from space.

the answer shows the construction "...is one of the many new satellites that ARE..."

For regular one of Xs constructions, it should be followed by a singular verb right?

No it is not necessary. IT depends.

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