【单选题】We should try not to use plastic bags,because they will____pollution for our soil.
【简答题】某化学兴趣小组为证明鸡蛋壳的主要成分是碳酸盐。进行下列实验:选择实验用具及药品用具:试管、铁架台(带铁夹)、单孔橡皮塞、玻璃导管、橡皮管、捣碎的鸡蛋壳。药品应选用___________________________________ 实验内容与记录(装置气密性已检查)
【单选题】We shouldn't use plastic bags. We should take our own bags ___.And we also should walk ___driving to the supermarket.
【单选题】Don't use plastic bags when you go ______.
【单选题】______ you use plastic bags, you mustn’t throw them about.
【判断题】登高作业安全用具试验主要是拉力实验,实验周期为一年。()
【单选题】—Can you tell me________ to live a low-carbon(低碳) life? —OK. Use both sides of the paper. Don't use plastic bags or disposable goods(一次性用品).
【单选题】进行科学实验时,都必须制定实验计划,以确保实验顺利完成。实验计划包括 [ ]
【简答题】登高作业安全用具的实验主要是拉力试验,实验周期是一年。()
【单选题】You mustn't _______ them everywhere _______ you use plastic bags. [ ]