问题
单项选择题
螺杆泵是利用()的回转来吸排液体的。
A.齿轮
B.螺杆
C.叶轮
D.活塞
答案
参考答案:B
螺杆泵是利用()的回转来吸排液体的。
A.齿轮
B.螺杆
C.叶轮
D.活塞
参考答案:B
An analyst does research about cash flow and gathers the following information (in thousands) about a company.
2011 | 2010 | |
Cost of goods sold | $14436 | $12471 |
Inventory (year end) | $3876 | $5980 |
Accounts payable (year end) | $7321 | $6432 |
A. $11443
B. $13221
C. $15651