酸消解土壤样品所用的坩埚应为（）。
A．瓷坩埚
B．镍坩埚
C．铂金坩埚
D．聚四氟乙烯坩埚
参考答案：D
建筑消防设施检查分为巡查、单项检查、联动检查三种方式。
Li Wei with his friends _______ work on the farm next week. [ ]
A. goes to
B. go to
C. are going to
D. is going to
