皮皮学，免费搜题
登录
搜题
【简答题】
将分子、原子、原子核、质子、中子或电子，分别填入下列有关空格内： （1）构成物质的粒子有多种，有的物质是由______构成的，如铁、汞等；有的物质是由______构成的，如氮气、水等． （2）氧化汞______是保持氧化汞化学性质的最小粒子，在化学变化中，氧化汞______分解成汞______和氧______，汞______直接构成汞，每两个氧______构成一个氧______，无数个氧______构成氧气． （3）氧原子中心有一个带8个单位正电荷的______，核外有8个______在一定范围的空间里作高速运动，由于每个______带一个单位负电荷，每个______带一个单位正电荷，______不带电，所以整个______不显电性． （4）由于______和______的相对质量约为1，氧的相对原子质量为16，可知氧的原子核内有8个______和 8个______个中子．
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】下面关于组合逻辑控制器正确的描述是:___。
A.
组合逻辑控制器是由软件实现的，所以比较灵活
B.
组合逻辑控制器是由硬件实现的，因此速度很快
C.
组合逻辑控制器是由软件实现的，所以容易修改
D.
组合逻辑控制器是一系列微指令实现的，因此体积很小
【简答题】Bill, Frank and Dave were three brothers. Every year they sent their mother expensive gifts on her birthday,. They liked to show her how rich they were. The eldest brother. Bill, had a lot of money an...
【简答题】Gifts tighten personal relationships and provide a means of communication between loved ones. People say that a gift lets the recipient（接受者） know we are thinking of them, and that we want to make the ...
【单选题】The gifts he brought from Britain()last week.
A.
sent out(送出)
B.
were sent out
C.
have sent out
【判断题】Gifts sent between close friends are usually practical or something needed.
A.
正确
B.
错误
【简答题】Gifts tighten personal relationships and provide a means of communication between loved ones. People say that a gift lets the recipient（接受者） know we are thinking of them, and that we want to make the ...
【简答题】Bill ,Frank and Dave were brothers. Every year, they sent their mother expensive gifts on her birthday .They liked to show her how rich and successful they were. The eldest brother ,Bill, had a lot of...
相关题目：
【单选题】The gifts he brought from Britain()last week.
A.
sent out(送出)
B.
were sent out
C.
have sent out