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【简答题】
一质量为4.0×10 3 kg,发动机额定功率为60kW的汽车从静止开始以a=0.5m/s 2 的加速度做匀加速直线运动后以额定功率运动,它在水平面上运动时所受阻的0.1倍,g取10m/s 2 ,求: (1)起动后2s末发动机的输出功率; (2)它以0.5m/s 2 的加速度做匀加速运动所能行驶的时间; (3)汽车以额定功率行驶时,当速度达到12m/s加速度大小; (4)汽车在此路面上所能行驶的最大速度;
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【单选题】Crosby's recent study of American historical demography is blithely based on the reconstitution of the records of single parishes, a method that often excludes migrants. Moreover, it is troublesome fo...
A.
summarizing the findings of a study
B.
placing new research within its historical context
C.
evaluating the methodology of a historian
D.
comparing various demographical techniques
E.
establishing categories
【单选题】朱红:红松鼠在糖松的树皮上打洞以吸取树液。既然糖松的树液主要是由水和少量的糖组成,大致可以确定红松鼠是为了寻找水或糖。水在松树生长的地方很容易通过其他方式获得。因此,红松鼠不会是因为找水而费力地打洞,它们可能是在寻找糖。 林娜:一定不是找糖而是找其他什么东西,因为糖松树液中糖的浓度太低了,红松鼠必须饮用大量的树液才能获得一点点糖。 由此可以推出,朱红的论证是通过以下哪种方式展开的?
A.
陈述了一个一般规律,该论证是运用这个规律的一个实例
B.
对更大范围的一部分可观察行为做出了描述
C.
根据被清楚理解的现象和未被解释的现象间的相似性进行类推
D.
排除对一个被观察现象的一种解释,得出了另一种可能的解释
【单选题】复合树脂充填V类洞,以下设计正确的是
A.
小缺损及中等缺损设计应尽量保守
B.
仅在釉质壁做斜面
C.
范围大的缺损应预备固位形
D.
固位形的设计可为固位沟
E.
以上都正确
【简答题】What does the recent study say? The recent study says that 1.______ people today are 2.______ worldwide.
【单选题】Multivitamins urged for all pregnant women A recent study in Tanzania found that when pregnant women took vitamins every day,fewer babies were born too small.Babies that weigh less than two and one-ha...
A.
20,000,000.
B.
18,000,000.
C.
2,000,000.
D.
38,000,000.
【单选题】朱红:红松鼠在糖松的树皮上打洞以吸取树液。既然糖松的树液主要是由水和少量的糖组成,大致可以确定红松鼠是为了寻找水或糖。水在松树生长的地方很容易通过其他方式获得。因此,红松鼠不会是因为找水而费力地打洞,它们可能是在寻找糖。 林娜:一定不是找糖而是找其他什么东西,因为糖松树液中糖的浓度太低了。红松鼠必须饮用大量的树液才能获得一点点糖。 朱红的论证是通过以下哪种方式展开的?( )
A.
陈述了一个一般规律,该论证是运用这个规律的一个实例
B.
对更大范围的一部分可观察行为做出了描述
C.
根据被清楚理解的现象和未被解释的现象间的相似性进行类推
D.
排除对一个被观察现象的一种解释,得出了另一种可能的解释
【单选题】Crosby's recent study of American historical demography is blithely based on the reconstitution of the records of single parishes, a method that often excludes migrants. Moreover, it is troublesome fo...
A.
summarizing the findings of a study
B.
placing new research within its historical context
C.
evaluating the methodology of a historian
D.
comparing various demographical techniques
E.
establishing categories
【简答题】A recent study confirmed the interconnectivity of different species, which many havealways known about. 查看材料
【单选题】The recent study has shown that people's attitudes towards protecting the environment are not with their behavior in daily life.
A.
consistent
B.
reliable
C.
satisfied
D.
enthusiastic
【单选题】Multivitamins Urged for All Pregnant Women A recent study in Tanzania found that when pregnant women took vitamins every day, fewer babies were born too small. Babies that weigh less than two and one-...
A.
20,000,000.
B.
18,000,000.
C.
2,000,000.
D.
38,000,000.
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