房地产投资的时间风险是房地产投资中与时间和时机选择因素相关的风险。 ( )
参考答案:对
下列化学用语均有错误,请将正确的化学用语填在相应的横线上:
(1)氯元素cL______; (2)2个硫酸根离子 (SO42-)2______;
(3)氧化钠 NaO______; (4)3个氧原子(3O2)______.
If triangle AOB is equilateral, O is the center of the semicircle ABC, and the radius of semicircle ABC is 6, what is the length to BC