The valve flaps are semicircular.阀瓣是半圆形的。
A.The valve has flaps shaped like a full circle. B.The shape of the valve flaps isa half ring. C.The valve flaps have a shape of half circle.正确答案C
The valve flaps are semicircular.阀瓣是半圆形的。
A.The valve has flaps shaped like a full circle. B.The shape of the valve flaps isa half ring. C.The valve flaps have a shape of half circle.正确答案C
