显微血管端—端吻合时，为保证血管通畅，减少血栓形成，常采用以下哪种方法()

A．端对端间断缝合

B．管壁轻度内翻，血管内膜达到良好的对合

C．管壁轻度外翻，血管内膜达到良好对合

D．血管内膜轻度外翻缝合，再将血管外膜覆盖加强，防止漏血或喷射状出血

E．管壁全层外翻缝合

Decomposition is the subdivision of project deliverables into smaller, more manageable components until the work and deliverables are defined at the work package level. This is a valuable tool for define scope. However, decomposition may not be possible for a deliverable or subproject if:

A) The deliverable or subproject is very complicated.
B) The deliverable or subproject is already being produced.
C) The deliverable or subproject will be accomplished after a very long time (i. e. far into the future).
D) None of the above: Decomposition of deliverables is always possible.