亚音速一元等熵气流在渐缩管道中随截面积减小,密度ρ( )。
A.(A) 减小
B.(B) 增大
C.(C) 不变
D.(D) 不确定
参考答案:A
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
5岁小孩,因抓翻桌上烫稀饭碗造成胸部烫伤,查体:上胸部烫伤面积约为该小儿3个手掌,水疱为主,未破溃。诊断为()
A.浅Ⅱ度烫伤3%
B.中度烫伤3%
C.深Ⅱ度烫伤3%
D.浅Ⅱ度烫伤6%
E.Ⅰ度烫伤6%