简述机电一体化对机械系
参考答案:
对机械系统的基本要求:高精度;快速响应;良好的稳定性。机械系统的组成:传动机构;导向机构;执行机构。统的基本要求及机械系统的组成。
-- Could you tell me ________?
--Sure. Go on until you reach the end. It’s on your right.
A.which country you come form
B.what’s your favorite city
C.how can I get to the bus station
D.if there is a bus station near here
细菌的分解代谢产物是指()
A.细菌素
B.硫化氢
C.吲哚
D.维生素
E.外毒素