Which two statements about zoning are correct? （） [" Zoning increases security."," DNS queries are used for software zoning."," Software zoning is more secure than hardware zoning."," When using zones and VSANs together, the zone is created first."," Zoning requires that VSANs be established before it becomes operational."]
（）年，ThomasR.Cech等人发现四膜虫细胞的26SrRNA前体具有自我剪接功能，将这种具有催化活性的天然RNA称为核酶―Ribozyme。
下列快捷键说法中不正确的是（） [" Shift+下箭头选择下一行。"," Shift+右箭头选择右侧的一个字符。"," Ctrl + A键选择文档的当前页。"," Shift+上箭头选择上一行"]
有关质量的叙述，不正确的是（）。 ["同一物体在地球上不同地方，它的质量是有一些差别的。","利用天平可以称出物体的质量。","速度一定的物体，它的动能与质量成正比。","质量大的物体惯性大，运动状态难改变。"]
半拖式拖车的场内运输转弯半径不宜小于（）。 ["A.10.0m ","B.12.0m ","C.14.0m ","D.15.0m"]
在评价利润中心的指标中，理论上最优的选择是（ ）。
