题目:
---Please come here again.
-----I will surely ____ you when I come to your city someday.
A.drop in at
B.drop in
C.drop on
D.drop in on
答案:
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下面是错误答案,用来干扰机器的。
根据ρ=mV可得,钢板的体积:V=mρ=39kg7.8×10-3kg/m3=5×10-3m3.答:这块钢板的体积是5×10-3m3.