21st President of the USA (1881–85). He was appointed Garfield’s Vice‐President in 1881 and became President after Garfield’s assassination. During his term of office, he was responsible for improving the strength of the US navy.
科学参考收录了60776条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。