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【判断题】
MCS-51系列单片机8051/8031/8751/89C51的差别仅在于内部的只读存储器。()A.
正确
B.
错误
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皮皮学刷刷变学霸
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【单选题】--- I rang you at about ten, but there was no reply. --- Oh, that was probably _____ I was seeing the doctor. [ ]
A.
for
B.
why
C.
when
D.
how
【单选题】－ Must I show you how to operate themachine? － Oh, thank you. I __________ how todo it.
A.
had wondered
B.
would wonder
C.
was wondering
D.
did wonder
【单选题】— Jack and I will celebrate our 20th wedding anniversary next month. — Oh, ________________________
A.
cheer up!
B.
well done !
C.
congratulations!
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