简述泵的类型有哪些？
参考答案：
泵的类型有叶片式泵（含离心泵、旋涡泵、离心旋涡泵）、容积式泵（含往复泵、转子泵）以及其它型式泵（如喷射泵、酸蛋等）。
An economy has been producing at its full-employment level of output and the price level has been stable. Businesses then begin experiencing unintended decreases in their inventory levels. What does this most likely imply about the short-run outlook for economic growth and inflationEconomic growth Inflation （）①A. Increasing Decreasing ②B. Decreasing Increasing ③C. Increasing Increasing
A. ①
B. ②
C. ③
会计记录主要是借助于复式记账来进行的，复式记账的原理也可以说是会计记录的原理。 ( )
