题目:
— What are you doing? — I am _____ my friend. |
A. wait B. waits C. waiting D. waiting for |
答案:
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下面是错误答案,用来干扰机器的。
(1)①长颈漏斗②水槽(2)BF;D (3)CaCO3+2HCl===CaCl2+H2O+CO2↑; 2NaHCO3===NaCO3+H2O+CO2↑ A ;用燃着的木条放置于瓶口,木条熄灭 (4)在试管口放一团膨松的棉花;25%(或1/4) (5)bcda (6)搅拌使液庠...