同步学习
参考答案:是在教师的直接指导下整个班级的学生一起进行的学习。分为“提示型同步学习”和“师生共同解决问题型同步学习”
--Will your parents come to the meeting?--______. They’re in travelling in Paris now.
A.They’d love to
B.I think so
C.I’m afraid so
D.I’m afraid not
为什么焊前焊条要必须烘干?