本课配套习题挑战模式1/5
单选题
难度系数:
1.下列各组元素,其符号大写字母相同的一组是
A: 钡、钙、钠 |
B: 氯、钙、铜 |
C: 镁、银、锰 |
D: 铝、氯、钠 |
一次做对,真牛!
+5奖励规则>
- 提示1:5Y+v5Lul5bCd6K+V5YaZ5Ye65ZCE5YWD57Sg55qE5YWD57Sg56ym5Y+377yM54S25ZCO6YCJ5oup56ys5LiA5Liq5aSn5YaZ5a2X5q+N55u45ZCM55qE5Y2z5Y+v
- 答案:Qg==
QemhueS4rS4g6ZKh77yIQmHvvInjgIHpkpnvvIhDYe+8ieOAgemSoO+8iE5h77yJPGJyPkLpobnkuK0uIOawr++8iENs77yJ44CB6ZKZ77yIQ2HvvInjgIHpk5zvvIhDde+8iTxicj5D6aG55LitLiDplYHvvIhNZ++8ieOAgemTtu+8iEFn77yJ44CB6ZSw77yITW7vvIk8YnI+ROmhueS4rS4g6ZOd77yIQWzvvInjgIHmsK/vvIhDbO+8ieOAgemSoO+8iE5h77yJPGJyPuWboOatpOmAieaLqULpobk=
本课配套习题挑战模式2/5
单选题
难度系数:
2.下列元素符号都表示金属的是
A: C、Cu、Ca |
B: S、Fe、P |
C: K、Mg、Ba |
D: H、Na、He |
一次做对,真牛!
+5奖励规则>
- 提示1:5bCG6YCJ6aG55Lit55qE5YWD57Sg5YaZ5Ye65p2l77yM5LiA5LiA5Yik5pat5Y2z5Y+v
- 提示2:5Zyo5Yik5pat5piv5ZCm5piv6YeR5bGe5YWD57Sg5pe277yM6Zmk5LqG5rGe5YWD57Sg5aSW77yM5omA5pyJ55qE6YeR5bGe5YWD57Sg6YO95bim5pyJ4oCc6ZKF4oCd44CC
- 答案:Qw==
QemhueS4rS4gQ++8iOeis++8ieOAgUN177yI6ZOc77yJ44CBQ2HvvIjpkpnvvIk8YnI+QumhueS4rS4gU++8iOehq++8ieOAgUZl77yI6ZOB77yJ44CBUO+8iOejt++8iTxicj5D6aG55LitLiBL77yI6ZK+77yJ44CBTWfvvIjplYHvvInjgIFCYe+8iOmSoe+8iTxicj5E6aG55LitLiBI77yI5rCi77yJ44CBTmHvvIjpkqDvvInjgIFIZe+8iOawpu+8iTxicj7nu7zkuIrvvIzlj6rmnIlD6aG55Z2H5Li66YeR5bGe5YWD57Sg
本课配套习题挑战模式3/5
单选题
难度系数:
3.有关自然界中元素的存在,某学生整理如下,其名称和符号不正确的是
A: 地壳中含量最多的金属元素铝C1 |
B: 空气中含量最多的元素氮N |
C: 人体中含量最多的元素氧O |
D: 太阳上含量最多的元素氢H |
一次做对,真牛!
+5奖励规则>
- 提示1:5pys6aKY5LiN5L2G6ICD5p+l5YWD57Sg56ym5Y+355qE5Lmm5YaZ77yM6L+Y5pyJ5YWz5LqO5YWD57Sg5bi46K+G55qE55+l6K+G44CC6aKY55uu6L6D5Li6566A5Y2V77yM5L2G5ZCM5a2m5Lus6KaB5rOo5oSP56ev57Sv5ZOmfg==
- 答案:QQ==
6ZOd5YWD57Sg55qE5YWD57Sg56ym5Y+35pivQWzjgII=
本课配套习题挑战模式4/5
单选题
难度系数:
4.下列化学用语,通常只表示微观意义,而不表示宏观意义的是
A: Ca |
B: N |
C: 2N |
D: He |
一次做对,真牛!
+5奖励规则>
- 提示1:55Sx6aKY5oSPQ2HvvJtO77ybSGXvvIzov5nkuInkuKrnrKblj7fvvIzml6LooajnpLrlvq7op4LmhI/kuYnvvIzlj4jooajnpLrlro/op4LmhI/kuYk=
- 提示2:6ICMMk7lj6rooajnpLoy5Liq5rCu5Y6f5a2Q77yO
- 答案:Qw==
55Sx5YiG5p6Q5Y+v55+l77yaQ2HvvJtO77ybSGXvvIzov5nkuInkuKrnrKblj7fvvIzml6LooajnpLrlvq7op4LmhI/kuYnvvIzlj4jooajnpLrlro/op4LmhI/kuYnvvIzlpoJDYeihqOekuuW+ruinguaEj+S5iemSmeWOn+WtkO+8jOWPiOihqOekuuWuj+inguaEj+S5ie+8mumSmeWFg+e0oOWSjOeJqei0qOmSme+8m+iAjDJO5Y+q6KGo56S6MuS4quawruWOn+WtkO+8juWImemAmuW4uOWPquihqOekuuW+ruinguaEj+S5ie+8jOiAjOS4jeihqOekuuWuj+inguaEj+S5ieeahOaYrzJO77yOPGJyPuaVhemAiUPvvI4=
本课配套习题挑战模式5/5
单选题
难度系数:
5.下列符号既表示一种元素,还表示一个原子,同时表示一种单质的是
A: H |
B: Fe |
C: CO2 |
D: O2 |
一次做对,真牛!
+5奖励规则>
- 提示1:5Y+q6KaB5pyJ5pWw5a2X77yM5bCx5LiN6IO95YaN6KGo56S65YWD57Sg44CC
- 答案:Qg==
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