问题
选择题
We offered him our congratulations ___ his passing the college entrance exams.
A．at
B．on
C．for
D．of
答案
答案：B
congratulate和它的名词congratulations要求接介词on。
搜题请搜索小程序“爱下问搜题”
We offered him our congratulations ___ his passing the college entrance exams.
A．at
B．on
C．for
D．of
答案：B
congratulate和它的名词congratulations要求接介词on。
表示阿伏加德罗常数的值。下列叙述正确的是( ) 
晶体中阳离子和阴离子的总数为0.03 N
硫酸与足量铜反应,生成
的分子数为0.92 N
溶液中离子总数小于3N