情景配对,将正确答案的序号填入题前括号里。 ( ) 1. What is your father doing? ( ) 2. What is your mother doing? ( ) 3. What is the cat doing? ( ) 4. What are you doing? A. I'm doing homework. B. He's playing football. C. She's cooking meals. D. It's eating fish.
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【单选题】某砂土地基,天然重度 g = 19kN/m 3 ,饱和重度 g sat = 21 kN/m 3 ,地下水位距地表 2m ,地表下深度为 4m 处的竖向自重应力为: ()