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【单选题】
两根平行的无限长直导线，分别通有电流I 1 和I 2 ，如图所示，已知其下方P点处磁感强度B=0，则两电流I 1 和I 2 的大小和有______。A.
I 1 ＞I 2 ，同向
B.
I 1 ＞I 2 ，反向
C.
I 1 ＜I 2 ，同向
D.
I 1 ＜I 2 ，反向
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举一反三
【单选题】Britain, ______________many other industrialized countries, ______ experienced major changes over the past 100 years.
A.
together with; have
B.
as well as; have
C.
in common with; has
D.
instead of ; has
【单选题】How many Dalehouse restaurants are there in other countries at the moment?
A.
One.
B.
Two.
C.
Three.
【简答题】阅读短文，完成下列表格。 I have many pen pals in many countries. Do you know the girl on the bike in the photo? She is one of my pen pals. Her name is Reiko. She is a Japanese student. We are the same(相同的) age - ...
【单选题】How many countries are the Nigerian organized criminals active in?
A.
more than 60.
B.
Less than 60.
C.
More than 70.
D.
Less than 50.
【简答题】如将变压器误接到等电压的直流电源上时,由于空载电流将 ,空载损耗将 。 (以上空填写变大,变小,不变,并简介原因)
【单选题】This kind of fruit not only sells well on the local market, but is also _____ to many countries at the same time. [ ]
A.
exploited
B.
exported
C.
explored
D.
exploded
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