相邻的植物细胞之间,依靠()互相交流营养物质. ["A、细胞质","B、细胞壁","C、胞间连丝","D、液泡"]
单缸四行程柴油机工作中开始点火是在() ["进气行程接近终了","做功行程开始","压缩行程开始","压缩行程接近终了"]
列哪几项是鼠疫的传播途径() ["A、鼠蚤叮咬","B、呼吸道","C、输血","D、皮肤粘膜"]
切多汁的水果时会流出液体,此液体主要来自于() ["A、细胞壁","B、细胞膜","C、细胞质","D、液泡"]
原则上,出现挤提苗头或发生挤提事件要()报告. ["一日内","立即","三日内","五日内"]
最小无限平板临界厚度 minimum critical infinite slab dimension