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【多选题】
某同学有一个电源,但上面的标志已经看不清了,无法辨认正负极.他为了辨别出电源的正负极,将电源与一个螺线管连接起来,在螺线管的附近放置一个小磁针,当他闭合开关后,下面的一些判断中正确的是A.
如果小磁针的N极向右转动，电源的a端是正极
B.
如果小磁针的N极向右转动，电源的b端是正极
C.
如果小磁针的N极向左转动，电源的a端是正极
D.
如果小磁针的N极向左转动，电源的b端是正极
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皮皮学刷刷变学霸
举一反三
【单选题】Success results hard work, and hard work results in success.
A.
from
B.
in
C.
by
D.
with
【单选题】Success results ___________ hard work, and hard work results in success.
A.
in
B.
from
C.
by
D.
with
【单选题】Which of the following statement is true according to the passage?
A.
Success results only from one's efforts and merits.
B.
Belief in luck may cultivate a passive attitude to life.
C.
Failure is synonymous with the absence of personal value.
D.
Sense of the role of luck builds up our modesty.
【简答题】Hard work results____ success, and success results ____ hard work.
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