皮皮学，免费搜题
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【判断题】
常用的 BCD 码有8421BCD码、 2421BCD 码、 5421BCD 码、码等。常用的可靠性代码有格雷码、奇偶校验码等。A.
正确
B.
错误
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】UNIT 1 PART 1 SECTION A TASK 2 2. Q: What will the woman do to help the man?
A.
Read his work.
B.
Look his work over and help him edit it.
C.
Pass it along to her friend to edit it.
D.
Pay someone else to write it for him.
【单选题】_______lit, almost all of the narrow staircases in the old library building can be dangerous for the first-time visitors.
A.
Poorer
B.
Poorest
C.
Poorly
D.
Poor
【单选题】One can narrow the search by specifying the range of employees, revenue and export figures, accepting only those companies that fall within the requested area.
A.
avenue
B.
import
C.
compensate
D.
earnings
【单选题】Narrow aisles can store ____ to ____ percent more product than conventional width aisles.
A.
30; 40
B.
20; 25
C.
15; 20
D.
10; 15
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