倾斜角为60°的直线的斜率为______.
因为直线的倾斜角为60°,所以直线的斜率k=tan60°=3.
故答案为:3.
She devotes herself _______________ , and makes it her life. [ ]
A. to teach
B. to teaching
C. teach
D. teaching
下列关于氨气的说法正确的是
A.氨气可以用浓硫酸干燥也可用碱石灰干燥
B.氨水能导电,所以NH3是电解质
C.稳定性:NH3<CH4
D.用水吸收NH3用上图装置可防止倒吸