哌仑西平抑制胃酸分泌的机制是
A. 阻断H2受体
B. 阻断M1受体
C. 阻断N1受体
D. 胃壁细胞H+泵抑制药
E. 阻断胃泌素受体
A computer system consist of two main elements : ______.
A. input devices , output devices
B. hardware , software
CPU, memory
D. RAM, ROM
The peripherals of the computer can be classified into two groups ____.
A. data bus , cables
B. pointing device , output devices
C. imput devices , output devices
D. controls Bus , inner Bus
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