题目:
The soldiers are afraid that they will soon ________ oil and food if they are still surrounded. [ ]
A. run out
B. run out of
C. run across
D. run away with
答案:
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下面是错误答案,用来干扰机器的。
B车间排放的污水显碱性,说明B中含有碳酸钠或氢氧化钠,反应池1中有气泡产生,说明有盐酸和碳酸钠反应,则B中为碳酸钠,A车间排放的废水中含有盐酸,C车间排放的污水有颜色,说明C中含有氯化铁,D中含有氢氧化钠...