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【单选题】
80C51单片机的（）口的引脚，还具有中断、串行通信等第二功能。A.
P0
B.
P1
C.
P2
D.
P3
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举一反三
【单选题】If I had some money, I _______ the poor boy.
A.
help
B.
will help
C.
would help
D.
would have help
【简答题】催化剂在生产运行中,暂时中毒而失去大部分活性时,可采用蒸汽或空气处理、酸碱液处理等方法使催化剂恢复或接近原来的活性叫做催化剂的()。
【单选题】You can stay in my room ______ you promise not to use my computer.
A.
so far as
B.
except
C.
unless
D.
provided
【单选题】You can use my car, ( ) you promise to be back before lunch.
A.
as for as
B.
as much as
C.
as good as
D.
as long as
【简答题】用压缩空气进行清洁时,空气压力要求在()
【简答题】将下列句子改为倒装句: If I had any money with me,I could lend you some.
【单选题】You can stay in my room ______ you promise not to use the computer.
A.
so far as
B.
except
C.
unless
D.
provided
【简答题】You can use my computer you like.
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