how heavy is hydrogen gas

How heavy is the pig How heavy is your testicle? how tall and how heavy is tom HOW heavy is your bag怎么回答 How ___ it is raining(heavy) how heavy is the elephant weight? heavy your how mother is怎么连? How heavy the box is?How heavy is the box?哪句正确? How heavy is it同义句How()does it(） no matter how heavy it snows和no matter how heavy the snow is 英语翻译Thereforedissociative adsorptionof hydrogen is reduced,a 1.2dm3 of hydrogen gas dissolved in 100cm3 of water.