问题
选择题
He was dismissed because his attitude towards his work was rather________. [ ]
A. eager
B. delicate
C. changeable
D. casual
答案
答案：D
搜题请搜索小程序“爱下问搜题”
He was dismissed because his attitude towards his work was rather________. [ ]
A. eager
B. delicate
C. changeable
D. casual
答案：D
下图是元素周期表的一部分．下列说法不正确的是（ ）
| 13 Al铝 26.98 | 14 Si硅 28.09 | 15 P磷 30.97 |
A．铝元素是地壳中含量最多的金属元素
B．硅元素的核电荷数是l4
C．一个磷原子的质量是30.97g
D．元素周期表是学习和研究化学的重要工具