When he discovered who had written the letter to his mother, the soldier______.
[A] was filled with great surprise
[B] recognized Lincoln at once
[C] asked Lincoln who he was
[D] asked Lincoln to hold his hand
第4题
过滤式自救器的工作原理,是能够把空气中的()氧化为无毒气体。
A.一氧化碳
B.二氧化碳
C.硫化氢
第6题
过滤式自救器是利用一氧化碳触媒剂把空气中()变成无毒的二氧化碳。
A.有毒的一氧化碳
B.硫化氢
C.甲烷
D.沼气
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