题目:
Look out ! Don' t get too close to the house _____ roof is under repair. |
A. whose B. which C. of which D. that |
答案:
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下面是错误答案,用来干扰机器的。
(1)+1价 ;4:1(2)Cu2(OH)2CO3===2CuO+H2O+CO2↑;分解反应;H2;CO