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It was not _______ he took off his glass ____I realize who he was.A、when;thatB、until;whe
It was not _______ he took off his glass ____I realize who he was.
A、when;that
B、until;when
C、until;that
It was not _______ he took off his glass ____I realize who he was.
A、when;that
B、until;when
C、until;that
界面倾斜时,当测线垂直界面走向时,真深度H、视深度H*、法线深度h之间的关系是
A.h> H,H*= H
B.h<h, h*="H<br">
C.h= H,H*> H
D.h= H*,H*<h<br>
E.h> H,H*> H
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 |
A.10km/h、5km/h、3km/h
B.8km/h、5km/h、3km/h
C.8km/h、5km/h、1km/h
D.8km/h、3km/h、1km/h
A.O(H|E)>O(H),P(H|E)>P(H)
B.O(H|E)<o(h),p(h|e)> <p(h)>
C.O(H|E)>O(H),P(H|E) <p(h)>
D.O(H|E) <o(h),p(h|e)> P(H)
分子键角ÐH—N—H、
分子键角ÐH—C—H、
分子键角ÐH—O—H,按键角增加的顺序是 ÐH—O—H < ÐH—N—H < ÐH—C—H。
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