问题
选择题
.Scientists are trying to develop a special material, _______ they will make use of in space.
A．it
B．that
C．what
D．one
答案
答案：D
搜题请搜索小程序“爱下问搜题”
.Scientists are trying to develop a special material, _______ they will make use of in space.
A．it
B．that
C．what
D．one
答案：D
(正反应放热)。下图是某一时间段中反应速率与反应进程的曲线关系图。回答下列问题