烧结过程中，碳酸钙的分解温度介于（）温度区间。
A.600—700℃
B.700—800℃
C.800—900℃
参考答案：B
A company may issue shares or borrow to raise capital for its business. In relation to company law, explain FIVE differences between share capital and loan capital. (10 marks)
能表示a≥10或者a≤0的关系表达式是 ______。
A．a＞=10 or a＜0
B．a＞10|a＜0
C．a＞=10||a＜＝0
D．a＞=10&&a＜=0
