NA为阿伏加德罗常数的值,下列说法正确的是( )
A:常温常压下,0.1molC8H18所含有的共价键数目为2.5NA
B:1L 1 mol•L﹣1 FeCl3溶液完全水解产生的Fe(OH)3胶体粒子数为NA
C:氢氧燃料电池正极消耗22.4L气体时,电路中通过的电子数目为4NA
D:28.6gNa2CO3•10H2O溶于水配成1L溶液,该溶液中阴离子数目为0.1NA
下列关于实验现象的描述,准确的是( )
从 的侧面看到的图形是轴对称图形。(判断对错)
平行用符号____ 表示,直线AB与CD平行,可以记作为____ .
Hello! I'm Ben. This is my new living room. It's quite big. There is a chair and two big sofas. There are some flowers beside the sofa. Between the sofas, there is a lovely cat. There aren't any pictures but a clock o n the wall. There is a computer on the desk next to the sofa. There is a TV set on the TV stand(电视柜) under the window. I often watch TV in my living room. What a nice living room.
① ____ ②____ ③____ ④ ____ ⑤ ____