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【单选题】
工件毛坯通过找正后划线，可使加工表面与不加工表面之间保持（）。A.
尺寸均匀
B.
形状正确
C.
位置准确
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】The marginal rate of technical substitution is
A.
the rate at which the firm can substitute labor for capital while holding total cost constant
B.
the rate at which the firm can substitute labor for capital while holding output constant
C.
the slope of the isocost curve
D.
both a and c
【单选题】The marginal rate of substitution is
A.
the slope of the utility curve
B.
the slope of the contract curve
C.
the slope of the utility possibilities curve
D.
none of these answer options are correct.
【单选题】The marginal product of labor in the production of computer chips is 50 chips per hour. The marginal rate of technical substitution of hours of labor for hours of machine-capital is 1/4. the marginal...
A.
50
B.
100
C.
150
D.
200
【单选题】以下对boolean 类型变理的描述,不正确的是
A.
boolean 类型的中文名称为“布尔”
B.
boolean 类型变量的值，只可能是“true”或“false”
C.
boolean 类型的变量，只能由“关系表达式”的结果来赋值
D.
boolean 类型的变量定义后，在使用前也必须进行“初始化”
【单选题】The marginal rate of substitution is equal to the
A.
slope of the demand curve.
B.
marginal cost of each good.
C.
magnitude of the slope of the indifference curve.
D.
relative prices of the two goods.
【多选题】关于理想信念的作用和意义,下列说法具有积极意义的是
A.
“梦想”比闹钟更容易让人早起
B.
缺乏理想，人也可以活的很潇洒。所以没必要为理想的有无而烦恼
C.
理想可以使人活得更优秀，这是人的本质属性所决定
D.
理想信念可以使人有效摆脱生活中鸡毛蒜皮的琐碎事情的烦恼
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