对怀孕几个月以上的女职工，用人单位不得延长劳动时间或者安排夜班劳动，并应当在劳动时间内安排一定的休息时间？（ ）
Passage Four The roots of the seven-day- week can betraced back about4,000 years,to Babylon. The Babylonians believed there wereseven planets in the solar system, and the number seven held such power to themthat they plan
一个线圈中的电流I随时间t的变化曲线如图所示
