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《中华人民共和国无线电管理条例》第四条规定：无线电频率资源属（），国家对无线电频谱实行（）、科学管理、有偿使用的原则。
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【单选题】It was July 24th when he arrived in London, ______ the 30th Olympic s would be declared open 3 days later.
A.
that
B.
how
C.
where
D.
Who
【简答题】衡量传感器的静态特性的指标包含( ) 、 ( ) 、 ( ) 、( )和漂移 。
【单选题】Today everyone arrived earlier than _______.
A.
expecting
B.
having expecting
C.
to expect
D.
expected
【单选题】—When did Cathy China? —She here on June, 26th. [ ]
A.
arrived in, arrived
B.
arrived at, got to
C.
reach to, got
D.
get to, arrived
【单选题】Having arrived at the station, _____.
A.
it was found that the train had left
B.
the train had left
C.
the train was found left
D.
he found that the train had left
【单选题】Our school is having a sports meeting. Someone ______ here already.
A.
arrived
B.
have arrived
C.
has arrived
【单选题】Having arrived at the station, _____.
A.
the train was found left
B.
he found that the train had left
C.
it was found that the train had left
D.
the train had left
【单选题】______ early for his date, Mark spent time reading the newspaper．
A.
Arriving
B.
Having arrived
C.
Arrived
D.
To arrive
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