幂级数的收敛半径为 A.
1 B.
2 C.
3 D.
4

单项选择题下列讨论哪个是错误的？ A、本题很清楚地说明，工业上用热电偶测高温，一定要考虑热辐射引起的误差，不采取措施，所测温度的相对误差将会达到10%以上 B、 C、 D、热电偶利用金属的电阻随着温度变化的特性进行温度的测量，所测电阻变化，需要利用惠斯顿电桥转换成电势差，表征出温度

单项选择题The following information relates to question 11 and 12. G Co makes the following purchases and sales. 1 January : Purchases 4,000 units for 2,000.15 February: Sales 3,000 units for 3,750.14 March: Sales 500 units for $1,200.At 31 March which of the following closing inventory valuations using FIFO is correct?