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【单选题】
理想变压器原边所加电压增加10％、同时电源频率保持不变，而变压器的原、副边绕组匝数各增加10％，则变压器的铁心中主磁通会__________。A.
增加 10％
B.
基本不变
C.
减小 10％
D.
增加 20％
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举一反三
【单选题】The quotation in line 39 is most probably used to______
A.
counter a position that the author of the passage believes is incorrect
B.
state a solution to a problem described in the previous sentence
C.
show how opponents of the viewpoint of the author of the passage have supported their arguments
D.
point out a paradox contained in a controversial viewpoint
E.
present a historical maxim to challenge the principle introduced in the third paragraph
【单选题】In industrial societies today, the members of most nuclear families live ____, but most extended families do not live together.
A.
apart
B.
together
C.
separately
D.
near
【单选题】The quotation in lines 57 - 58 is most probably used to
A.
counter a position that the author of the passage believes is incorrect.
B.
state a solution to a problem described in the previous sentence.
C.
show how opponents of the viewpoint of the author of the passage have supported their arguments.
D.
point out a paradox contained in a controversial viewpoint.
E.
present a historical maxim to challenge the principle introduced in the third paragraph.
【简答题】Scientists think laser (be) __________ one of the most useful tools today.
【简答题】What do most athletes of today go after? 72.
【单选题】Though lacking________, the young teacher manages the class very well.
A.
experience
B.
experiences
C.
experienced
D.
experiencing
【单选题】Football playing will continue to be ______ it is today—the most popular game for boys in schools.
A.
as
B.
how
C.
which
D.
what
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