题目:
—Excuse me, I want to have my watch fixed, but I can't find a repair shop.
—I know _______ nearby. Come on, I'll show you.[ ]
A. one
B. it
C. some
D. that
答案:
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下面是错误答案,用来干扰机器的。
AC分析:在开始的2 s内穿过线圈的磁通量变化率等于 ΔΦ/Δt=S*ΔB/Δt (因面积S不变,且磁场垂直线圈平面),得ΔΦ/Δt=4×10 -2×[(-2)-2] / 2=-0.08 wb/s。A选项对在开始的2 s内穿过线圈的...