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【单选题】
74LS160方式是( )A.
异步
B.
同步
C.
不知道
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参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】Neither Tom nor John ______ a bike of ______ own.
A.
have, their
B.
has, his
C.
have, his
D.
has, their
【单选题】I often have conversation with John over _____ phone, but keep in touch with Tom by writing _____ letters.
A.
/; the
B.
/; a
C.
the; /
D.
the; a
【单选题】用单色光观察牛顿环，测得某一亮环直径为3mm，在它外边第5个亮环直径为4.6mm，用平凸透镜的凸面曲率半径为1.0m，则此单色光的波长为
A.
6080 Å
B.
5903 Å
C.
7600 Å
D.
三个数据都不对
【单选题】Tom: How long have you worked in this department? John:______.
A.
The atmosphere in this department is free.
B.
Seven weeks ago.
C.
Just about six months.
D.
You can say it again.
【简答题】在用位示图管理磁盘存储空间时，位示图的尺寸由磁盘的______决定。
【单选题】用单色光观察牛顿环,测得某一亮环的直径为3mm,在它外边第5 个亮环的直径为4.6mm,所用平凸透镜的凸面曲率半径为1.03m,则单色光的波长为多大?()
A.
580nm
B.
600nm
C.
590.3nm
D.
550nm
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