挑战习题
1/5单选题
难度:

1.下列说法中错误的是
A 所有的原子核都由质子和中子构成
B 铅笔芯里含有石墨
C 氢氧化钠固体可以干燥氧气
D 分子、原子都在不断地运动着
提示1:
5rCi5Y6f5a2Q5Lit5peg5Lit5a2Q44CC
提示2:
5rOo5oSP6ZOF56yU6Iqv5Lit55qE5oiQ5YiG5piv55+z5aKo77yM5bm26Z2e6ZOF44CC
正确答案:QQ==
QeOAgeacieeahOWOn+WtkOaguOS4reayoeacieS4reWtkO+8jjxicj5C44CB6ZOF56yU6Iqv5Li76KaB5piv55Sx55+z5aKo44CB57KY5Zyf562J54mp6LSo57uE5oiQ77yOPGJyPkPjgIHmsKLmsKfljJbpkqDlm7rkvZPlrrnmmJPlkLjmlLbmsLTvvIzlj6/ku6XlubLnh6XmsKfmsJTvvI48YnI+ROOAgeW+ruingueykuWtkOmDveaYr+S4jeaWrei/kOWKqOeahO+8jjxicj7mlYXpgIlB