1、SAS②SSS； ③ Atomic absorption spectrometry

2. The corresponding sides of congruent triangles are equal.

3、5

4, from AB=AD,? BAC=？ DAC, then BC=DC

5. A.

6. Omission

Comprehensive? promote

7. Omission

8, because BD=DF, DE=DM,? BDE=？ medium density fiberboard

So △ de△ ?△FDM, so? BEM=？ electromotive force (EMF)

There is only one straight line parallel to the known straight line at a point outside the straight line, so A, C and E are on the same straight line.