问题
选择题
Einstein, the famous scientist, was born _______ March, 1879. [ ]
A. at
B. on
C. in
D. to
答案
答案：C
搜题请搜索小程序“爱下问搜题”
Einstein, the famous scientist, was born _______ March, 1879. [ ]
A. at
B. on
C. in
D. to
答案：C
当采用普通C级螺栓和摩擦型高强螺栓时，上式中的
时可分别为（）。