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【单选题】
理想变压器原加电压增加10％、同时电源频率增加10％，则变压器的铁心中主磁通会________A.
增加 10％
B.
减小 10％
C.
增加 20％
D.
基本不变
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举一反三
【单选题】关于元素周期表，下列表述中正确的是( )。
A.
周期表有7个周期，16个主族
B.
周期表有7个周期，8个主族
C.
周期表有9个周期，16个族
D.
周期表有9个周期，8个主族
E.
周期表有7个周期，16个族
【简答题】元素周期表有 个周期, 个主族, 个副族。
【单选题】Although people spend less time on their jobs, they still feel they do not have enough leisure time because of the following except ______.
A.
spending some time with their children
B.
doing physical exercises
C.
spending some time on learning
D.
fulfilling family and social obligations
【单选题】The survery shows that if people cannot afford house, they will feel less content about ___life．
A.
the; the
B.
a; /
C.
a; the
D.
/; the
【单选题】Although people spend less time on their jobs, they still feel they do not have enough leisure time because of the following except ______.
A.
fulfilling family and social obligations
B.
spending some time with their children
C.
spending some time on learning
D.
doing physical exercises
【单选题】People who exercise _______________ are less likely to feel stress.
A.
regularly
B.
formally
C.
mostly
D.
publicly
【简答题】元素周期表知识 元素周期表中有 ( )个周期, ( )主族 周期数= ( ) 主族数= ( )
【单选题】Some people feel that television should give less ______ to sport.
A.
programs
B.
coverage
C.
concern
D.
involvement
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