在气体流动的通道风,(),变化能反映气体流量的变化
参考答案:压力差
阅读下列课文,根据课文中的内容完成表格。(每空一词 )
Dear Alice,
I’m from San Diego in California. I’m twelve years old. Magda is my twin sister. It’s very strange --- Magda and I are twins, but we’re very different. I’m outgoing and Magda is quiet.
My favourite sport is basketball. And I’m on the school team. Magda likes reading. She likes reading storybooks best. My favourite subjects are geography(地理) and science(科学). Magda likes English and history better..
Our parents are from Poland(波兰). My dad is called Stan. He is forty-two. He is a doctor in a hospital in San Diego. He likes watching TV. My mum is Ewa and she is three years younger than my dad. She teaches English in a school. She often listens to music. I have a happy family. What about yours?
Write to me soon.
Yours,
Simon
省、自治区、直辖市人民代表大会和人民政府制定的地方法规、地方规章不能作为海关的执法依据。 ( )