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【单选题】
关于磁场和磁感线,下列说法正确的是( )A.
磁铁是磁场的唯一来源
B.
磁感线是磁体的北极出发而到南极终止
C.
两磁感线空隙处不存在磁场
D.
自由转动的小磁针放在通电螺线管内部,其N极指向通电螺线管磁场北极
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【单选题】What is NOT stated about the membership?
A.
The membership fee should be paid.
B.
It can be used at the Sunset Beach Hotel.
C.
It is valid for one year.
D.
It can be used with other promotional offers.
【简答题】The membership of REN21.
【单选题】After you_______the attached form, please send it to us within 7 working days to be eligible for our two-year warrant program.
A.
will complete
B.
completed
C.
having completed
D.
have completed
【单选题】please send us samples ( )for our reference
A.
airmail
B.
by airmail
C.
airmailing
D.
by airmailing
【单选题】For more information, please send an e-mail, ____ you can also include your advice to us.
A.
when
B.
where
C.
which
D.
that
【简答题】游标卡尺的尺身每一格为1mm，游标共有50格，当两量爪并拢时，游标的50格正好与尺身的49格对齐，则该游标卡尺的读数精度为（）。
【简答题】节奏听写7 输入代号,字母小写,连续输入,不要空格。
【简答题】If
you want to apply for membership, click ______.A. Try it free for three months B. Learn more about membership
【单选题】If you want to apply for membership, click ______.
A.
Try it free for three months
B.
Learn more about membership
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