The new models of artificial hearts are expected ______.
A.to have a working life of 10 or 20 years B.to be set fully in the patient’s chest C.to be equipped with an external power source D.to create a new passage for infection正确答案B
The new models of artificial hearts are expected ______.
A.to have a working life of 10 or 20 years B.to be set fully in the patient’s chest C.to be equipped with an external power source D.to create a new passage for infection正确答案B
