从能量转换的观点看,液压马达和液压泵是相互可逆工作的液压元件。
参考答案:对
I thought you________be employed by that company because you had________knowledge of French.[ ]
A . will; the
B. would; a
C. can; /
D. could; /
工艺流程图的绘制包括(),(),()三个阶段。