The difference between regular mail and e-mail in terms of costs is______.
A. e-mail is many times more expensive
B. e-mail costs the receiver
C. e-mail costs nothing to send
D. e-mail saves the cost of paper
钠泵转运Na+、K+的机制是
A. 单纯扩散
B. 以通道为中介的易化扩散
C. 以载体为中介的易化扩散
D. 主动转运
E. 胞吐
胃溃疡恶变的治疗是
A. 抑制胃酸
B. 减少胆汁反流
C. 保护胃黏膜
D. 根除幽门螺杆菌(HP)
E. 早期手术
葡萄胎时主要增高的是
A. 血淀粉酶检测
B. 血清甲胎蛋白检测
C. 腹部CT检查
D. 血CEA
E. 绒毛膜激素
微信支付 
支付宝支付