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【单选题】
性别字段最适合选择 ( ) 。A.
字符串类型
B.
整型
C.
枚举类型
D.
浮点型
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【判断题】Nearly five billion trees are cut down annually for paper making worldwide, representing 45 per cent of all harvested trees.
A.
正确
B.
错误
【单选题】--- Mary looks a bit _____. It seems that she doesn't know what to do. --- Right. After all , it is the first time she _____ a speech in public.
A.
nervous; had made
B.
proud; had made
C.
nervous; has made
D.
proud; has made
【单选题】Nearly all trees have seeds that fall to the earth, take root, and eventually ________.
A.
generate new seeds
B.
new seeds generated
C.
by generating new seeds
D.
new seeds generated there
【单选题】对称三相负载星形连接时,下面说法正确的是( )
A.
线电流等于相电流
B.
线电流是相电流的√3 倍
C.
线电压等于每相负载的相电压
D.
线电压是每相负载相电压的√3倍
【单选题】It should be made known to the public _________ the money raised has gone.
A.
where
B.
what
C.
which
D.
that
【单选题】Nearly all trees have seeds that fall to the earth, take root, and eventually_______.
A.
generate new seeds
B.
new sees generated
C.
generating new seeds
D.
new seeds are generated
【单选题】对称三相负载星形连接时,下面说法正确的是( )。
A.
线电流等于相电流
B.
线电流是相电流的1.732倍
C.
线电压等于每相负载的相电压
D.
线电压是每相负载相电压的1.732倍
【简答题】All of us make our sacrifices Everyone has a unique role in society. In this time of public cr, it’s important that each of us stick to our roles and play them well. What can ordinary people do in...
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