如果温度上升2℃记作2℃,那么温度下降3℃记作______.
“正”和“负”相对,
所以如果温度上升2℃记作2℃,
那么温度下降3℃记作-3℃.
故答案为:-3℃.
已知对任意实数x,有f(-x)=-f(x),g(-x)=g(x),且x>0时f'(x)>0,g'(x)>0,则x<0时[ ]
A.f'(x)>0,g'(x)>0
B.f'(x)>0,g'(x)<0
C.f'(x)<0,g'(x)>0
D.f'(x)<0,g'(x)<0
No navigational aids are shown and the chart is not kept corrected for alterations in depths inside the pecked lines. For more detailed information, the larger scale charts must be().
A.referred to
B.appreciated
C. met with
D.concerned