讨论法的特点是教师同学生答。( )
参考答案:错
When it comes to the civil war in Syria, the US government’s attitude towards it has experienced a(n)_______ change , which may have a positive effect on Syria present situation.
A.superior
B.superb
C.subtle
D.stubborn
橡胶衬里管道可输送工作压力和温度为()的多种介质
A.0.6Mpa、50℃以下
B.0.6Mpa、80℃以下
C.0.3Mpa、50℃以下
D.0.3Mpa、80℃以下