这两句话的语法是否都正确?

问题描述:

这两句话的语法是否都正确?
(1)China has a larger population than that of the U.S.A.
(2)The population of China is larger than that of the U.S.A.
The diode produces about nine times more radiant power than that one.此句语法是否正确?

(1)去掉that of 整个句子是这样:Chian has a larger population than the USA has ,避免重复省略has 了
(2)对的
补充句子是对的.