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【单选题】
对于图中给出的轴（轴垂直屏幕），图中哪个力的力矩方向是垂直纸面向里的？ 【图片】A.
只有3
B.
只有4
C.
1和2
D.
1,2和4
E.
1,2和3
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【单选题】A series of attempts ______ , we came to a wonderful solution to the problem.
A.
had been made
B.
were made
C.
having made
D.
having been made
【简答题】脱式计算要灵活（能简算的要简算）。 （1）7.5×10.4 （2）4.36÷0.25÷40 （3）[3.3+（1.35+0.42）]×7.8 （4）1.7+0.9×17-0.79-0.21
【简答题】Nike Needs to Raise Worker’s Minimum Wage, Not Minumum Age Let’s not be too quick to canonize Nike. Philip Knight, Nike’s multibilionare Chairman and chief executive, managed to generate a lot of posi...
【简答题】At a primary school in a small town in the east of South Carolina, second-grade teachers Garneau and Lynne are convinced that separating elementary-age boys and girls produces immediate academic impro...
【单选题】We in Shanghai ever since we came to China.
A.
lived
B.
are living
C.
have lived
D.
had lived
【简答题】直接写得数 7.2÷1.2= 40-37.5= 11.6+2.4= 2÷0.2= 5×99+5= 400×6= 7.5×0.2= 2.5+0.9= 0.24×5= 0.25×4×3=
【简答题】我能算得又快又对。 0.25×40= 8.4÷2.1= 0.9×0.5= 13.2÷0.1= 1÷0.01= 0.÷8= 0.5×0.2= 1-0.12= 0.12÷0.3= 9-9×0.1= 1.8+0.2×3= 3×0.125×8=
【简答题】直接写出得数 3.82-1.9= 35 16 - 2 3 = 0.37+4.8= 0.9×99+0.9= 3.14÷0.1= 3 2 ÷3= 2 5 -0.004= 1 4 ÷3- 1 4 ÷3 = 0.25×40= 7.2× 1 9 = 30% + 1 5 = 21 33 ÷ 8 21 ÷ 5 7 ×0 =
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