Which of the following may indicate a chemical attack?
A) Oily film on water surfaces
B) Unusually heavy structural damage
C) Unusual number of sick or dying people or animals
D) Suspicious packages that weigh more than they should

Question

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The Answer of Which of the following may indicate a chemical attack?
A) Oily film on water surfaces
B) Unusually heavy structural damage
C) Unusual number of sick or dying people or animals
D) Suspicious packages that weigh more than they should

Which of the Following May Indicate a Chemical Attack