我国“神州7号”载人飞船承载着三名航天员顺利完成太空翱翔,成功返回地面。在太空舱里,为了保持舱内O2、CO2气体含量的相对稳定,常用NiFe2O4作催化剂将航天员呼出的CO2转化为O2。NiFe2O4中铁为+3价,则Ni的化合价为()
A:+1
B:+2
C:+3
D:+4
老高和老伴有6间私房。10年前老伴去世,老高现已年近70,丧失了劳动能力。两个儿子不孝,很少尽到赡养义务。而大侄女高红对他很好,不但每月从工资中拿出100元给他当生活费,还经常来问寒问暖。因此,他想让大侄女继承他的两间私房。下列表述正确的是( )
There was once a lonely girl who wanted love very much.One day while she was walking in the forest,she found two birds.She took them home and put them in a small1.She was happy to have two“friends”.She2them with love and the birds grew strong.One day the girl forgot to close the door of the cage.The 3of the two flew out of the cage.The girl was afraid that it would fly away.She caught it quickly.She felt glad that she caught the bird before it could fly away.Suddenly she couldn’t4a sound from the bird.When she opened her hand,the bird was already(已经)dead.Her5killed(杀死)the bird! Then she saw6bird jumping up and down7the cage.She could feel its great need for freedom.It wanted to fly into the blue sky.So she let it fly away8.The bird circled(转圈)once,twice,and three times.The girl9as the bird flew.She didn’t care about losing the bird any more.She wanted it to be happy.Suddenly the bird flew closer and landed softly on her shoulder.It sang the10song she had ever heard(她所听过的).The fastest way to lose love is to hold it too tightly,and the best way to keep love is to give it wings.
航天飞机用氢作燃料,这是因为氢的____ 较大.人们用冷水冷却汽车发动机,用热水取暖,主要是因为水的____ 较大.通常情况下,与同等质量的其他物质构成的物体相比,升高或降低相同温度,水吸收或放出的热量较____ (填“多”或“少”).
某微信公众平台使用了梁某所拍摄的4幅摄影作品,不仅没有指明作者为梁某,还故意裁剪掉含有表明作者身份的水印,换上有该微信公众平台字样的水印。梁某将这家微信公众平台背后的某公司起诉至法院并胜诉。该公司的行为侵犯了梁某的 ( )