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【简答题】
( )和( )是常见的输入设备,( )和 ( )是常见的输出设备。
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举一反三
【单选题】___ six years since I began to study English.
A.
It is
B.
I have been
C.
There are
D.
It was
【单选题】It _____ six years since his grandfather died. [ ]
A.
is
B.
was
C.
had been
D.
will be
【单选题】( )six years since I began studying English.
A.
They have been
B.
It is
C.
It was
D.
There are
【简答题】电弧电流的本质是离子导电。()
【多选题】白云岩的形成机理有:
A.
原生沉淀作用、准同生白云化作用、成岩白云化作用
B.
调整白云化作用、淡水白云化作用、混合白云化作用
C.
原生沉淀作用、毛细管浓缩作用、回流渗透白云化作用
D.
原生沉淀作用、次生作用、热液作用、成岩作用
【简答题】电弧电流的本质是分子导电。( )
【单选题】It's six years since I _______ him. [ ]
A.
have known
B.
will know
C.
had known
D.
know
【单选题】__________ nearly six years since I started to study English
A.
It was
B.
There are
C.
It is
D.
There have been
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