图示为光纤力传感器：悬臂梁上下表面分别加工深0.5mm、宽0.5mm的平行槽，将马赫琴特干涉仪的两根光纤分别固定其中。悬臂梁受力时，上下光纤长度形变相反，实现对力的测量。下面说法正确的是（ ）

A、该光纤传感器的测量原理为强度调制
B、力的作用引起的应变效应和折射率变化，导致两根相位发生变化
C、两根光纤的相位变化方向相反，输出信号的相位差为每根光纤相位变化的2倍
D、该传感器属于非功能型光纤传感器
E、相比应变片测量方式，光纤力传感器灵敏度高，但是使用时连接复杂，成本高

单项选择题​静止时边长为50cm的立方体，当它沿着与它的一个棱边平行的方向相对于地面以匀速度,运动时，在地面上测得它的体积是（）‌ ​‌

单项选择题The following information has been tanken or calculated from Fowler's financial statements for the year ended 30 September 20X5: Cash cycle at 30 September 20X5 70 days Inventory turnover six times Year-end trade payables at 30 September 20X5 2 million Cost of sales for the year ended 30 September 20X5 $1.8 million What is Fowler's trade receivables collection period as at 30 September 20X5?The following information has been tanken or calculated from Fowler's financial statements for the year ended 30 September 20X5: