正常人体生理状态下钙泵转运过程属于下列细胞膜跨膜物质转运中的哪一种()
A.单纯扩散
B.易化扩散
C.主动转运
D.胞吞
E.被动转运
参考答案:C
The young lady, seveal attempts to fix her cell phone,decided to have another try.
A.making
B.having made
C.to make
D.to have made
平屋顶的坡度一般为()。
A、2-3%
B、1-3%
C、3-5%
D、5-10%