煤矿规划区井网部署时需要考虑：
A、井间干扰
B、煤矿采掘
C、钻井可行性
D、经济效益

单项选择题'晚发性矽肺'发病时间一般在脱离矽尘作业后

单项选择题Please choose the correct statement or practice: A、The product prototype has been made and the entrepreneurial team has been set up. It is estimated that it will win the school’s entrepreneurial bonus. Therefore, it is not necessary to look at the competition rules, nor to participate in the series of lectures and participation sharing meetings held by the school. B、Equity financing or debt financing? Since there is no absolute standard, then draw lots and choose one randomly. C、Equity financing is to exchange equity for capital, which will lose equity. Debt financing is equivalent to using tomorrow’s money today, which is of great financial risk. Neither of the two financing methods is considered. D、Participating in the entrepreneurship competition to get bonus or apply for relevant subsidies will neither lose equity nor pay back the money. Therefore, for college students without financial resources, it is a preferred financing method.