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[名词解释] 反打镜头

A tackle is “two blocked” when the blocks are(). ["equally sharing the load","jammed together","as far apart as possible","rove to the highest mechanical advantage"] 关于蒸腾作用,下列描述哪些是正确的?() ["蒸腾作用不仅仅与气孔有关","大气水蒸气浓度是决定蒸腾速率的决定因素,气孔下空间水蒸气浓度对蒸腾速率不重要","干旱影响气孔的开放状态主要是因为干旱诱导植物合成更多的脱落酸","植物在适度光照条件下蒸腾速率提高的原因是光诱发气孔张开"] 下列()是输入设备。 ["显示器","打印机","音箱","键盘"] 在一定的操作条件下,管道的实际输量与计算通过能力之比值的百分数,称为() ["输气管道的利用率","输气管道的输送效率","输气管道无故障运转率","输气管道的输送率"] 原油乳状液的粘度值比纯净的原油或水的要大(),不具有可加性。 ["1倍","5倍","千倍","数十至数百倍"] 反打镜头
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