皮皮学,免费搜题
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【单选题】
What are doing here? I ________ for you for ages!
A.
have been looked
B.
have been looking
C.
looked
D.
had been looking
拍照语音搜题,微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【单选题】We’ll our homework to our teacher email.
A.
sent,by
B.
send ,by
C.
send ,on
D.
sent, on
【单选题】设a='计算机等级考试',结果为'考试'的表达式是( )。
A.
Left(a,4)
B.
Right(a,4)
C.
Left(a,2)
D.
Right(a,2)
【单选题】—— Alice looks sad. Did you tell her about the accident?    ——— Yes, but I ________ her just before her final exams.
A.
shouldn’t tell
B.
shouldn’t have told
C.
needn’t tell
D.
mustn’t have told
【简答题】2kV= V ,610mV= V,1mV= μV= V
【单选题】——Alice looks sad. Did you tell her about the accident? ——Yes, but I    ______ her just before her final examinations.
A.
should have told
B.
shouldn’t have told
C.
needn’t have told
D.
must have told
【单选题】--- Alice looks sad. Did you tell her about her brother’s accident? --- Sorry, I ________ her just before her final exams.
A.
can’t tell
B.
mustn’t have told
C.
needn’t tell
D.
shouldn’t have told
【判断题】电网的形状一般以“Y”字型为主。高度不低于1m,电压控制在1000V—10000V之间。
A.
正确
B.
错误
【单选题】交流电梯额定速度不超过1m/s时,渐进行安全钳动作速度V应()M/S。
A.
V≤1.5
B.
V>1.5
C.
1.5≤V<3< /div>
D.
1.5≤V<1< /div>
【简答题】电路如下图a所示,已知V DD =15V,R G =1MΩ,R S =R L =2kΩ,场效应管I DSS =4mA,U GS(off) =-4V
【简答题】2kV= A,610mV= V,1mV= μV= V
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