题目内容
（请给出正确答案）
[主观题]
He______________be hungry一he's just had lunch. A. can't B. must C. ought t
He______________be hungry一he's just had lunch.
A. can't
B. must
C. ought to
D. might
如搜索结果不匹配，请 联系老师 获取答案
优先编码器74HC147的功能表如下表所示，试用74HC147和适当的门构成输入为低有效的
，输出为8421BCD码，并具有编码输出标志的编码器。
| 输入 | 输 出 |
| overline{I_{1}}overline{I_{2}}overline{I_{3}}overline{I_{4}}overline{I_{5}}overline{I_{6}}overline{I_{7}}overline{I_{8}}overline{I_{9}} | overline{Y_{3}}overline{Y_{2}}overline{Y_{1}}overline{Y_{0}} |
| H H H H H H H H H × × × × × × × × L × × × × × × × L H × × × × × × L H H × × × × × L H H H × × × × L H H H H × × × L H H H H H × × L H H H H H H × L H H H H H H H L H H H H H H H H | H H H H L H H L L H H H H L L L H L L H H L H L H L H H H H L L H H L H H H H L |
