（）主要由开石，高岭石，和辰砂组成。
参考答案：鸡血石
There ____ a sports meet in our school. I will take part in the long jump.
A．is going to have
B．has
C．is going to be
D．will have
以润滑油罐车装完后停放20min~30min为例,首末次高差平均值为2.58mm也就是说首次测量高度较末次测量高度低平均2.58mm
