转晶法衍射花样有什么特征？
参考答案：层线：衍射斑点分布在一系列平行直线上。
零层线：通过入射斑点的层线。
正负第一、第二层线：对零层线对称。
The ______ way is based on the premise that the teacher should be silent as much as possible in the classroom and the learner should be encouraged to produce as much language as possible.
国际多式联运的运费费率指（）
A.运输费用
B.装运港包干费用
C.中途港的中转费用
D.A，B，C项内容相加
