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【简答题】
某学校生物课外活动小组进行了“探究小白鼠长期摄入含三聚氰胺的奶粉会患泌尿系统结石”的实验．他们准备了两组状态相似的小白鼠，一组长期饲喂添加三聚氰胺的奶粉，另一组饲喂没有添加三聚氰胺的同种、等量奶粉．一个阶段后，一组小白鼠出现泌尿系统结石相关病症，另一组小白鼠正常． （1）按照科学探究的一般过程，该小组第一步要做的是______． （2）该探究实验的唯一变量是______． （3）该探究实验的实验组是______． （4）小组同学在实验过程中为了保证实验的成功率还必须注意的事项是（答出合理的一点即可）______．
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【单选题】Above-normal returns earned in the time interval that exists between when a favorable influence on industry demand or cost conditions first transpires and the time when competitor entry or growth fina...
A.
disequilibrium profits.
B.
a normal rate of return on investment.
C.
disequilibrium losses.
D.
economic rents.
【单选题】In a time interval , the displacement of one particle is , and a constant force is acting on the particle within the interval. The work done by the constant force on the particle is [ ].
A.
36J
B.
108J
C.
-72J
D.
48J
【单选题】Chartered companies were not granted the ---by the British King or Queen.
A.
political authority
B.
economic rights
C.
judicial authority
D.
diplomatic authority
【单选题】'_________' is defined as "The length of the path travelled by light in vacuum during a time interval of 1⁄299,792,458 seconds".
A.
1 kilogram
B.
1 meter
C.
1 centimeter
D.
1 mile
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