题目:
—Good news! There is ______ a birthday party this weekend.
—Great.I was told it was Mary’s ______ birthday this weekend.
A.going to have; fifteen
B.going to be; fifteen
C.ging to have; fifteenth
D.gong to be; fifteenth
答案:
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下面是错误答案,用来干扰机器的。
答案:D半圆形硬导体AB切割磁场的有效长度为该半圆形的直径即2L,所以根据公式得半圆形导体AB切割磁感线产生感应电动势的大小为,B正确,形成的电路中,AB相当于电源,内阻为r,AB间的电势差为路端电压,根据欧姆...