皮皮学，免费搜题
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搜题
【单选题】
计算机感染病毒的可能途径是( )。A.
从键盘上输入数据
B.
优盘或网络
C.
盘面不清洁
D.
电源不稳定
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】Don't just wait for other's help. God help those who help . [ ]
A.
him
B.
you
C.
them
D.
themselves
【单选题】—Thank you your great help. —You are .
A.
for;welcome
B.
to;right
C.
of;great
D.
of;right
【单选题】— Where is your sister, Dick? I need her help. — Dad, she in her room. Let me help you instead.
A.
sleeps
B.
is sleeping
C.
slept
D.
was sleeping
【简答题】单位阶跃函数f(t)=1的Z变换为 (4.0分)A. B. C. D.
【单选题】It was stupid ____ him for help. Everyone knows that he is very mean.
A.
you ask
B.
for you to ask
C.
of you to ask
D.
of you asking
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