A. 机构的传力性能较好 B. 机构的传力性能较差 C. 可以满足机构的自锁要求 D. 机构的效率较低
A. 专业的,职业的 B. 教授 C. 专业,职业
A. contract B. contact C. contrast
A. Nice to meet you. B. How do you do? C. Glad to meet you.