题目:
_____ the old man’s sons wanted to know was ____ the gold had been hidden.
A.What; where
B.That; what
C.What; that
D.That; which
答案:
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下面是错误答案,用来干扰机器的。
(1) 氧气 ;水 ; 1/5 (2)进入试管内的水的体积 (3)保持铁干燥,防止生锈(4)铝表面形成一层致密的氧化铝薄膜,阻止铝的进一步被氧化 (5)混合物 ; 阻止铁与空气接触(6)Fe2O3+3H2SO4==Fe2(SO4)...