【单选题】— ? — They're fine, thank you. [ ]
D.
How are your mother and father
【单选题】The U.S. government and some of the American people believe that reducing America's dependence on foreign petroleum is one of the reasons to start research into the possibility of using ethanol.
【简答题】看图补全对话。 Tom: Hello, this is Tom speaking. Grandma: Hi, Tom, this is grandma. What is your mother doing? Tom: My mother is c_____________. Grandma: What is your father doing? Tom: My father is s_______...
【判断题】在对高速及重型机械进行力分析时必须计及其各构件的惯性力。
【单选题】在对高速及重型机械进行力分析时必须计其各构件的()。