DSP--4000系列数字式电缆分析仪可提供一套完整的测试、验证()的功能,还能进行文档备案。
A.网络
B.电缆和光缆
C.计算机
D.线缆连接器
参考答案:A
A salesperson works 50 weeks each year and makes an average (arithmetic mean) of 100 sales per week. If each sale is worth an average (arithmetic mean) of $1,000, then what is the total value of sales made by the salesperson in a year ?()
A.$50,000
B.$100,000
C.$500,000
D.$1,000,000
E.$5,000,000
用脉冲多普勒技术除哪项外均可增大检测血流速度最大值()
A.降低发射频率
B.增大COSθ角度
C.减低取样深度
D.移动零位基线
E.减小COSθ角度