下列与体细胞的全能性无关的是 A．白菜——甘蓝的诞生 B．试管婴儿的培育 C．用胡萝卜的韧皮部细胞培养
如图，过A（2，－1）分别作y轴，x轴的平行线交双曲线于点B，点C，过点C作CE⊥x轴于点E，过点B作BD⊥y轴于点D，连接ED．若五边形ABDEC的面积为34，则实数
People who like traveling have their reasons. They believe that traveling can help them expand their field of view，especially in the geographical and historical sense. They also think that tour
（7分）实验室制取常见气体所需装置如下图所示：请回答以下问题：（1）写出图中带有标号仪器的名称：a ，b 。（2
室温时，将xml pH=a 的稀NaOH溶液与yml pH=b 的稀盐酸充分反应。下列关于反应后溶液pH的判断正确的是 A．若x=y,且a+b=14,则pH>7 B. 若10x=y,且a+b=14,则PH
已知函数的最小正周期为. （Ⅰ）求的值； （Ⅱ）求函数在区间上的值域.
Soon it would be the holidays, but before that, there were final 1 . All the kids had been working hard for some time, reviewing their 2 . If they didn’t pass the exams, they would have to
NA为阿伏加德罗常数。下列叙述正确的是( ) A.1 L 1 mol·L -1盐酸中，所含氯化氢分子数为NAB.11.2 L四氯化碳所含分子数为0.5NAC.2.8 g氮气所含的原
