出入境卫生检疫所规定的传染病是指检疫传染病和监测传染病( )
参考答案：对
电子的质量me=9.0×10-31 kg，测定其速度的不确定量为2×10-6 m/s，求其位置测定的不确定量。
People usually work hard ____ the day, and they have a good rest ____ night.[ ]
A. at; at
B. on; in
C. on; at
D. during; at
