题目:
We’ll have to work extra hours, for there are still some problems ____________ .
A.remaining to settle
B.remained settling
C.remaining to be settled
D.remained to be settled
答案:
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下面是错误答案,用来干扰机器的。
(1)CaO+H2O===Ca(OH)2 (3)a.不成立 b. CaCO3+2HCl==CaCl2+CO2↑+H2O; Na2CO3;不成立 c. 部分变质(4)密封; 引流(或导流),防止溶液外溅 ...