A．waterB．oxygenC．energyD．heat

We have made a （an）try to carry out the plan.A.attemptB.effortC.energyD.source

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材料题请点击右侧查看材料问题 查看材料A.waterB.airC.ener

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材料题请点击右侧查看材料问题 查看材料A.waterB.liquidC.m

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Which fire fighting agent has the greatest capacity for absorbing heat？A.waterB.dry chemic

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A centrifugal pump can’t supply water after startingYou should check ____.A.priming waterB

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61._________A. waterB. airC. energyD. safety

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59._________A.. waterB. liquidC. methodsD.sources

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