搜题请搜索小程序“爱下问搜题”
问题
单项选择题
正硅酸钙的表达式为()。
A.CaO·SiO
2
B.3CaO·2SiO
2
C.2CaO·SiO
2
D.3CaO·SiO
2
答案
参考答案:C
选择题
One of the most important questions the government had to consider was _____ of public health.
A. what
B. this
C. that
D. which
查看答案
判断题
铁路局所属的机车回送时至少配备两班机车乘务员,以保证回送速度。
查看答案