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【简答题】
How good projects grow Are you interested in projects (课题,项目) and want to have a good one? Well, that doesn't come easily. You need to do the following tasks(任务): TALK: You and your classmates discuss in detail (详细的) all that you would like to do to realize (实现) your project. WRITE: One of your classmates acts as (担任) secretary (秘书). He or she keeps full notes as your group discusses. Later he or she will sort (整理) your ideas to make them better. PLAN: With the secretary's notes, your group makes a list of everything you'll need and who will get, do or research what. DO: Each group member gets, does and researches something on the list.Your group puts together all you have found and tries to make the project more well-organized.You prepare (准备) to present (展示) it in class. SHOW: You and your classmates show (给……看) the world the result of your hard work.Knowing all the above (上面), you may want to try a project. Why not start with this:you can find out more about the history of your city. What did it look like?  Which famous people lived there? To grow good projects Talk Write Plan Do Show Discuss every-thing 1 . The secretary should 2 while you are discussing. 3 of your needs and make everyone's task clear. Do the research work and make the project 4 . Show 5 to the world. 1. _____   2. _____   3. _____   4. _____   5. _____
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【单选题】下列关于平静呼吸的描述,错误的是
A.
吸气时肋间外肌收缩
B.
吸气时膈肌收缩
C.
呼气时呼气肌收缩
D.
呼气时膈肌舒张
E.
呼气时肋问外肌舒张
【简答题】设随机过程X(t)=Ucos2t,其中U为随机变量,且E(U)=5,D(U)=6,试求:
【判断题】成本是企业制订产品价格的重要因素和进行决策的重要依据。( )
A.
正确
B.
错误
【简答题】设随机变量X~U(0,a),且数学期望E(X)=3,求方差D(X).
【单选题】成年人平静吸气时,呼吸肌的活动情况是(  )
A.
肋间外肌和膈肌都舒张
B.
肋间外肌和膈肌都收缩
C.
肋间外肌收缩、膈肌舒张
D.
肋间外肌舒张、膈肌收缩
【简答题】设随机变量X~U(a,b),且数学期望E(X)=2,方差D(X)=3,求参数a,b.
【多选题】为了确保“未知弱酸 溶液标准解离常数”测定的准确度 , 下 列正确的操作是 。
A.
先用蒸馏水润洗,然后用未知弱酸 溶液 洗三遍
B.
滴定前不用赶气泡
C.
未知弱酸溶液滴加的速度一直保持每分钟 10mL
D.
读取刻度时,读取液面两侧的最高点处刻度
【简答题】设随机变量X与Y独立,X~U(0,2),Y~e(2),求:
【判断题】成本是企业制订产品价格的的重要因素和进行决策和理要依据。 ( )
A.
正确
B.
错误
【简答题】设随机变量X与Y独立,X~U(0,2),Y~e(2),求(X+Y)的期望
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