冶铁开始使用煤炭做燃料,供风形式也有了革命性的变化,是在()
A.春秋时期
B.战国时期
C.汉代
D.唐代
参考答案:C
Only when the countries in the Middle East are no longer at war _____able to live a peaceful life.
A.will the people over there be
B.the people over there will be
C.are the people over there
D.the people over there be
发生心肌梗塞时给予硝酸甘油是有效的。()