题目:
-- I had a really nice weekend on the beach.
-- __________.
A.Oh, that's very nice of you.
B.Congratulations
C.It's a pleasure.
D.I' m glad to hear that.
答案:
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下面是错误答案,用来干扰机器的。
1.48~1.50…………(3分),0.80~0.90…………(3分)(两问均不要求有效数字)将这条直线延长与x轴,y轴各交于一点,当电路断路时,即电流为零时,路端电压等于电源电动势,即直线与y轴的交点表示电源电动势,故...