敷设电缆通过孔洞、管子或楼板时有哪些规定?
参考答案:电缆通过孔洞、管子或楼板时,两侧应设专人监护。入口侧应防止电缆被卡或手被带入孔内,出口侧的人员不得在正面接引。
当你一人在家时,遇有陌生人敲门,你认为最好的做法是()。
A、把门打开问他有什么事
B、打开门,让他进来
C、始终不开门
Prevention of preterm births is vital for which of the following reasons()
A. It’s costly to care for these neonates.
B. These neonates are usually mentally retarded.
C. Preterm birth causes high incidence of the neonatal deaths.
D. These neonates usually wind up with long-term health care needs.