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【单选题】
5位无符号二进制数字最大能表示的十进制整数是A.
64
B.
63
C.
32
D.
31
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【简答题】以下哪一项明显违反了“勤勉尽职”的要求?（ ）
【单选题】At which lay er of the OSI model does the Spanning Tree Protocol (STP) operate at（）
A.
Lay er 5
B.
Lay er 4
C.
Lay er 3
D.
Lay er 2
E.
Lay er 1
【单选题】The Solo Trek is able to lift off the ground by using ______ .
A.
a solar powered engine
B.
engine-powered twin fans
C.
large flapping wings
D.
rotating blades
【简答题】Rough ER has ( ), but smooth ER does not.
【单选题】What is the meaning of "Solar Powered"
A.
Has many functions,
B.
Water does not cause a problem,
C.
Gets power from the sun,
D.
You can use wifi with this product.
【简答题】下列明显违反了“勤勉尽职”的要求的是（ ）
【简答题】A solar car is an electric car powered by solar electricity.
【简答题】以下哪一项明显违反了“勤勉尽职”的要求?（ ）
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