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【单选题】
在四位数1□20中的方框里填一个数字，使它能同时被2、3、5整除，最多有（ ）种填法．A.
2
B.
3
C.
4
D.
无数种
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【单选题】______ the passage of light, many new plastics are processed using technologies rivaling those used in the manufacture of computer chips.
A.
For the better of
B.
Permitting better
C.
To better permit
D.
It is better for
【单选题】“T”是正确,“F”是错误,请根据题目进行判断是“正确的”还是“错误的”。 Protecting the present and future environment is basic task for all of humankind,and efficient recycling of plastics,eco-friendly knitted fabrics and synthetic fi...
A.
T
B.
F
【简答题】readonly
【单选题】Some hard plastics can be______ metals in manufacturing machine parts.
A.
substituted for
B.
taken the place of
C.
replaced in
D.
given way to
【简答题】两个均质圆轮A和B,质量均为m,半径均为r,用细绳连接如图所示,轮A绕固定轴O转动。细绳的质量和轴承摩擦不计。求轮B下落时两个轮子的角加速度、B轮质心C的加速度以及绳的张力。
【单选题】______ the passage of light, many new plastics are processed using technologies rivaling those used in the manufacture of computer chips.
A.
For the better of
B.
Permitting better
C.
To better permit
D.
It is better for
【单选题】Plastics can`t______steel completely
A.
instead
B.
instead of
C.
take the place of
D.
take place
【简答题】Question 3 A plastics monopolist faces the demand curve P=180 - Q, where Q is measured in thousands of pounds per year and P is measured in dollars per pound. Marginal cost is constant at MC=＄60 per p...
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