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【单选题】
下列属于极性溶剂的是?A.
水
B.
乙酸乙酯
C.
液状石蜡
D.
植物油
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举一反三
【简答题】54 Fire Extinguisher_标清.mp4 Watch the video and try to answer the questions: 3. Who can use the fire extinguisher skillfully?
【单选题】关于渠道断面设计边坡系数m的选择说法不正确的是（ ）
A.
m越大，渠道边坡越缓
B.
m越大，渠道工程量越大
C.
m越大，渠道输水损失越小
D.
m越大，渠道占地越多
【简答题】54 Fire Extinguisher_标清.mp4 Watch the video and try to answer the questions: 1. what are the different parts of the fire extinguisher?
【简答题】A—fridge B—cupboard C—cooker D—oven glove E—microwave F—draining board G—floor H—washing machine I—dishwasher J—toaster K—food processor L—fire extinguisher M—breadboard N—wastebasket O—dishcloth 51. ...
【简答题】A—assembly line J—safety boots B—packer K—shipping clerk C—forklift L—time card D—explosive materials M—warehouse E—fire extinguisher N—hard hat F—loading dock O—earplug G—machine operator P—hand truc...
【简答题】54 Fire Extinguisher_标清.mp4 Watch the video and try to answer the questions: 4. Where can you find the fire extinguisher? Please upload some pictures.
【简答题】54 Fire Extinguisher_标清.mp4 Watch the video and try to answer the questions: 2. Please summarize how to use the fire extinguisher.
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