Why was the black box redesigned in 1965?
A) New materials became available by that time.
B) The early models didn't provide the needed data.
C) The early models often got damaged in the crash.
D) Too much space was needed for its installation.
第2题
A.窦房结
B.心房肌
C.房室交界
D.浦肯野纤维
E.心室肌
心脏内传导速度最快的部位是E.
第3题
A.窦房结
B.心房肌
C.房室交界
D.浦肯野纤维
E.心室肌
心脏内传导速度最快的部位是E.
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