13N-NH3进入心肌的机制错误的是()。
A.钠钾ATP酶转运
B.自由扩散
C.心肌细胞主动摄取
D.心肌细胞胞饮
E.钙离子通道转运
参考答案:A, C, D, E
生物能进行呼吸,绝大多数生物需要吸入_______,呼出__________。
It is well known to us all that a lot of rivers _______by factories.
A.are polluting
B.have been polluting
C.are being polluting
D.are being polluted