问题
选择题
________ was known to us all that Johnson had broken his promise ________ he would give each of
us a small gift.[ ]
A．As; which
B．What; that
C．It; that
D．It; which
答案
答案：C
搜题请搜索小程序“爱下问搜题”
________ was known to us all that Johnson had broken his promise ________ he would give each of
us a small gift.[ ]
A．As; which
B．What; that
C．It; that
D．It; which
答案：C
，沸点是131.4℃，熔点是9.79℃，不溶于水，易溶于醇、丙酮等有机溶剂。在实验室中可以用下图所示装置来制备1，2-二溴乙烷。其中试管c中装有液溴（表面覆盖少量水）。