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【单选题】
硅酸盐水泥时间不小于 45min ,终凝时间不大于( ),普通硅酸盐水泥初 凝不小于 45min ,终凝不大于( )。A.
360min ， 500min
B.
390min ， 500min
C.
360min ， 600min
D.
390min ， 600min
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反馈参考答案：
举一反三
【单选题】If the marginal cost of producing the next unit of output exceeds the average total cost, then:
A.
the average total cost curve is increasing.
B.
the marginal cost curve is at its minimum.
C.
the average total cost curve is decreasing.
D.
the average total cost curve is at its minimum.
【单选题】Average total cost (ATC) is calculated as follows:
A.
a. ATC = (change in total cost)/(change in quantity of output).
B.
b. ATC = (change in total cost)/(change in quantity of input).
C.
c. ATC = total cost/quantity of output.
D.
d. ATC = total cost/quantity of input.
【单选题】Whenever marginal cost is greater than average total cost,
A.
a. marginal cost is rising.
B.
b. marginal cost is falling.
C.
c. average total cost is rising.
D.
d. average total cost is falling.
【单选题】If an increase in output results in a decrease in average total cost, the corresponding marginal cost is:
A.
. less than average total cost.
B.
. greater than average total cost.
C.
. equal to average total cost.
D.
. negative.
【单选题】If marginal cost is less than average total cost, then ________ is ________.
A.
average total cost; falling
B.
average variable cost; falling
C.
marginal cost; falling
D.
marginal cost; rising
【单选题】下列哪个不是SQL注入漏洞发生的原因
A.
攻击者可以对输入变量进行控制
B.
服务器对用户的输入没有进行安全处理
C.
没有对数据库进行安全配置
D.
不对用户显示详细的SQL错误信息
【单选题】If marginal cost is GREATER THAN average total cost:
A.
. average total cost is increasing.
B.
. average total cost is decreasing.
C.
. average total cost is unchanged.
D.
. marginal cost is decreasing.
【简答题】环节动物的血液呈红色，是因为血细胞中含有血红蛋白。()
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