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【单选题】
要做到安全用氧就必须做好“四防”，以下不属于“四防”的是A.
防火
B.
防震
C.
防水
D.
防油
E.
防热
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A.
had studied
B.
have been studying
C.
studied
D.
was studying
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A.
向他挥手打招呼
B.
悄悄移步到她身边与之攀谈
C.
视而不见
D.
微笑点头致意，中场休息时再去找她叙旧
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