在工程中，我们通常会用到的器件接头为（）。 A: ASMA接头 B: BBNC接头 C: CDIN头 D: DN接头

Pus produced by streptococcus infection is thin and easily diffused. The main reason is that pathogen can produce A: yaluronidase B: asma coagulase C: streptokinase D: streptodornase E: he F: hemolysin