Da2 using the perturbative QCD approach based on kT factorization. The branching ratios are predicted to be (60.6-16.5-10.4-2.1+17.3+4.3+3.2 )× 10-6 for B0→Ds- K2*+, (1.1-0.4-0.2-0.1+0.4+0.1+0.1)×10-6 for Bs→D0a20 and (2.3-0.8-0.4-0.1+0.8+0.2+0.1)×10-6 for Bs→D-a2+. They are large enough to be measured in the ongoing experiment. Due to the shortage of contributions from penguin operators, there are no direct CP asymmetries for these decays in the Standard Model. We also derive simple relations among these decay channels to reduce theoretical uncertainties for the experiments to test the accuracy of theory and search of new physics signal."> Pure annihilation type decays B<SUP>0</SUP>→D<SUB>s</SUB><SUP>-</SUP> K<SUB>2</SUB><SUP>*+</SUP> and B<SUB>s</SUB>→Da<SUB>2</SUB> in perturbative QCD approach -
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