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【单选题】
在 MCS-51 系统中,若晶振频率为 6MHz ,一个机器周期等于( ) μs 。A.
1
B.
2
C.
3
D.
4
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举一反三
【单选题】—Did you like the book I gave you?—______the novels that Ive read,I enjoyed this one the most.
A.
Of all
B.
All of
C.
For all
D.
From all
【单选题】Ive no idea when shell be back. ______you wait or come back later is up to you.
A.
When
B.
If
C.
Whether
D.
That
【单选题】Some of my fondest memories are when Ive put together a large group of friends and did nothing but______.
A.
to hang out
B.
hanging out
C.
hang out
D.
hung out
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