现代电子计算机之父是__________。
A．爱因斯坦
B．巴贝齐
C．冯.诺依曼
D．图灵
参考答案：C
We usually accept payment by irrevocable L/C payable （） shipping document.
A. among
B. between
C. against
D. about
互补离子效应
