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【单选题】
关于 PC机主板上的CMOS芯片,下面说法中正确的是A.
加电后用于对计算机进行自检
B.
它是只读存储器
C.
用于存储基本输入 /输出系统程序
D.
需使用电池供电，否则主机断电后其中数据会丢失
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【单选题】--You didn’t wait for Mike last night, did you? ---No, and we____ for him. He didn’t return home at all.
A.
didn’t need to wait
B.
needn’t waiting
C.
needn’t have waited
D.
didn’t need wait
【单选题】.As long as we are united, there will be no difficulty in the world that we can’t__________.
A.
overcome
B.
reject
C.
undertake
D.
sacrifice
【简答题】CINRAD/SA 型多普勒天气雷达射频信号峰值功率为 750Kw ,发射脉冲宽度为 1us ,脉冲重复频率为 1000Hz 。( C 取 3 × 10 8 m/s ),求平均发射功率。
【简答题】阅读下面的材料，然后根据材料内容回答问题。 What is to blame（归咎于） for the smog (雾霾) hitting China? The question that has bothered people for a long time got an answer recently. According to Wang Yuesi, a researcher at the ...
【单选题】____ little tramp was ____ social failure but was loved for his optimism and determination to overcome all difficulties.
A.
a, the
B.
the, a
C.
the, /
D.
a, /
【简答题】根据所给汉语提示选用适当的单词完成句子，每空仅限一词。 小题1:In Pride and Prejudice five sisters overcome __________ (障碍) to their happiness and marriage. 小题2:If you want to know how to study____________ (高效率地), come and join our...
【简答题】CINRAD/SA型多普勒天气雷达射频信号峰值功率750kW,发射脉冲宽度为1μs,脉冲重复频率为1000Hz。求平均发射功率Pav。
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