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【简答题】
按数集扩充的顺序填空: (1)自然数集→(2)( )→(3)( )→(4)( )→(5)( ); 在上题中(1)对( )运算封闭; (2)对( )运算封闭; (3)对( )运算封闭; (4)对( )运算封闭; (5)对( )运算封闭。
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参考答案：
举一反三
【判断题】原子吸收分光光度法可以用来测定绝大多数的非金属元素。
A.
正确
B.
错误
查看完整题目与答案
【判断题】对数字信号进行算数运算和逻辑运算的电路称为数字电路
A.
正确
B.
错误
查看完整题目与答案
【单选题】US firm submitted a fixed bid for a Euro multimillion project in Ukraine. The contract will be awarded in 12 months and the company knows there will be no advance payments. The company
A.
should pay the premium for a 3 months put currency option to hedge the quotation exposure.
B.
should write 3 months put currency option, receive the premium and roll it forward.
C.
should buy 12 months put option and limit the loss to the premium amount if the bid gets rejected.
D.
should get 1 year Euro denominated loan equal to the bid amount.
查看完整题目与答案
【多选题】A credit required the goods should be shipped by 12 monthly installments and before the 5th day of each month. The goods were shipped as scheduled from Junuary to May, while the seller failed to make...
A.
Payments for shipment in February
B.
Payments for shipment in April
C.
Payments for shipment in May
D.
Payments for shipment in June
查看完整题目与答案
【单选题】关于电位与参考电位的概念,下列说法正确的是 。
A.
只有在直流电路中才能设参考电位,交流电路中不能
B.
电位就是电压
C.
电路中某点的电位等于该点与参考点之间的电位差
D.
在同一个电路或电气系统中,可视分析的方便,选电路中不直接导线相连的两点作为参考电位点
查看完整题目与答案
【多选题】下列有关电位与电压的说法,正确的是
A.
某点电位是该点到零电位参考点之间的电压
B.
两点间电压是绝对的物理量
C.
电位是绝对的的物理量
D.
电压值会随着0点位参考点选取不同而不同
查看完整题目与答案
【单选题】Payments should be made _______ sight draft.
A.
at
B.
upon
C.
by
D.
after
查看完整题目与答案
【单选题】关于电位与参考电位的概念,下列说法正确的是
A.
只有直流电路才能设参考电位，交流电路中不能
B.
电位就是电压
C.
电路中某点的电位等于该点与参考点之间的电位差
D.
在同一个电路或电气系统中，可视分析的方便，选电路中不直接导线相连的两点作为参考电位点
查看完整题目与答案
【单选题】Homer's Holesome Donuts has determined that its profit-maximizing quantity is 10,000 donuts per year. Homer's earns $12,000 in revenue from the sale of those donuts. Homer's has two costs. First he pa...
A.
Yes, because he is incurring an economic loss.
B.
Yes, because all costs are fixed in the long run.
C.
No, because he is making an economic profit.
D.
No, because all costs are variable in the long run.
查看完整题目与答案
【多选题】下列有关跨步电压说法正确的是（）
A.
跨步电压与入地电流强度成正比，与接地体的距离平方成反比
B.
在靠近接地体的区域内，如果遇到强大的雷电流，跨步电压较高时，易造成对人、的伤害
C.
通过接地网或接地体流到地中的电流，会在地表及地下深处形成一个空间分布的电流场，并在离接地体不同距离的位置产生一个电位差，这个电位差叫做跨步电压
D.
跨步电压并不会造成人身触电危险
查看完整题目与答案
相关题目：
【判断题】原子吸收分光光度法可以用来测定绝大多数的非金属元素。
A.
正确
B.
错误
查看完整题目与答案
【判断题】对数字信号进行算数运算和逻辑运算的电路称为数字电路
A.
正确
B.
错误
查看完整题目与答案
【单选题】US firm submitted a fixed bid for a Euro multimillion project in Ukraine. The contract will be awarded in 12 months and the company knows there will be no advance payments. The company
A.
should pay the premium for a 3 months put currency option to hedge the quotation exposure.
B.
should write 3 months put currency option, receive the premium and roll it forward.
C.
should buy 12 months put option and limit the loss to the premium amount if the bid gets rejected.
D.
should get 1 year Euro denominated loan equal to the bid amount.
查看完整题目与答案
【多选题】A credit required the goods should be shipped by 12 monthly installments and before the 5th day of each month. The goods were shipped as scheduled from Junuary to May, while the seller failed to make...
A.
Payments for shipment in February
B.
Payments for shipment in April
C.
Payments for shipment in May
D.
Payments for shipment in June
查看完整题目与答案
【单选题】关于电位与参考电位的概念,下列说法正确的是 。
A.
只有在直流电路中才能设参考电位,交流电路中不能
B.
电位就是电压
C.
电路中某点的电位等于该点与参考点之间的电位差
D.
在同一个电路或电气系统中,可视分析的方便,选电路中不直接导线相连的两点作为参考电位点
查看完整题目与答案
【多选题】下列有关电位与电压的说法,正确的是
A.
某点电位是该点到零电位参考点之间的电压
B.
两点间电压是绝对的物理量
C.
电位是绝对的的物理量
D.
电压值会随着0点位参考点选取不同而不同
查看完整题目与答案
【单选题】Payments should be made _______ sight draft.
A.
at
B.
upon
C.
by
D.
after
查看完整题目与答案
【单选题】关于电位与参考电位的概念,下列说法正确的是
A.
只有直流电路才能设参考电位，交流电路中不能
B.
电位就是电压
C.
电路中某点的电位等于该点与参考点之间的电位差
D.
在同一个电路或电气系统中，可视分析的方便，选电路中不直接导线相连的两点作为参考电位点
查看完整题目与答案
【单选题】Homer's Holesome Donuts has determined that its profit-maximizing quantity is 10,000 donuts per year. Homer's earns $12,000 in revenue from the sale of those donuts. Homer's has two costs. First he pa...
A.
Yes, because he is incurring an economic loss.
B.
Yes, because all costs are fixed in the long run.
C.
No, because he is making an economic profit.
D.
No, because all costs are variable in the long run.
查看完整题目与答案
【多选题】下列有关跨步电压说法正确的是（）
A.
跨步电压与入地电流强度成正比，与接地体的距离平方成反比
B.
在靠近接地体的区域内，如果遇到强大的雷电流，跨步电压较高时，易造成对人、的伤害
C.
通过接地网或接地体流到地中的电流，会在地表及地下深处形成一个空间分布的电流场，并在离接地体不同距离的位置产生一个电位差，这个电位差叫做跨步电压
D.
跨步电压并不会造成人身触电危险
查看完整题目与答案
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