At present in logic people have different opinions on the question whether reduction to absurdity is direct refutation or indirect one.

Iodobenzene diacetate promoted direct reaction of ketone and phenol in water

Direct reaction and indirect reaction carried out the ozone oxidization reaction of organic matter.

The prepared mechanism of Fe Matrix-TiC_p composite which worked in direct reaction were discussed in this paper.

Based on the published paper of present anthor (Ruan & Xu,1996) and Siegel s model of polarizability,this paper first derives a direct inversion method for interpretation of IP sounding curves.

Based on the Dar Zarrouk curves and the conception of longitudinal conductance and transverse resistance,a direct inversion method of one-dimension direct current sounding curves is derived.

The BP neural network is introduced in direct inversion with measured data of flow as input value and river roughness as output value.

Specifically, it examinedwhether the direct feedback or the indirect feedback in the way of underlining with adescription of types of errors led the learners to improve their linguistic accuracy butreduce the writing complexity.

The results showed that both experimental groups made significant improvement with indirect feedback more effective than direct feedback.