—Could you tell me ________________?

—I don’t know. It seemed to be cool, powerful and confident.

A．why “Carrier Style” is known to all in China

B．when was “Carrier Style” so popular in China

C．where “Carrier Style” is popular

D．how was “Carrier Style” well-known in China

喷射混凝土是以（）为动力，将掺有（）的混凝土拌合料与水汇合成浆状、喷射到坑道的岩壁上并迅速凝结而成的细石混凝土。喷射混凝土的工艺流程有干喷、（）、（）和（）。