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【单选题】
比较指令用来比较两个具有______数据类型的有符号数。A.
相同
B.
不同
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【单选题】Not only the sailors but also the captain of the ship _____ frightened during that voyage.
A.
has
B.
have
C.
was
D.
were
【单选题】In the opinion of many Americans and Europeans, we only began to really explore our world in the sixteenth century. According to them, the sailors of the ancient world did not explore distant parts of...
A.
According to the writer, we only began to really explore the world in the sixteenth century.
B.
In the history of science, people sometimes have to discover a fact a second time.
C.
The ancient Egyptians had very little knowledge about the stars.
D.
The writer agrees with many Americans and Europeans except for the two facts mentioned in the passage.
【单选题】正弦交流的基本概念---20008 已知某正弦电压 V, 当 时 V, 当 时, V, 则该正弦电压有效值 等于 答( ) 答( )
A.
100V
B.
86.6V
C.
70.7V
D.
122.5V
【简答题】正弦交流电网电压值，如380V，220V，指的是（ ）。
【单选题】Not only sailors but also the captain of the ship _______ frightened during that voyage.
A.
has
B.
have
C.
was
D.
were
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