矿床空间分布规律的主要研究内容?
参考答案:
具体体现为:
丛聚性分布:矿化集中区、成矿区域
带状分布:全球性成矿带、区域分带、矿田分带、矿床分带、矿体分带等距性分布
根据所给表格仿照例子写句子。
Today is June third. This is Li Ming's day.
Now it is June fourth. What did Li Ming do yesterday?
例: He walked to school at eight thirty on June third.
1. He ______to Miss Zhang at _______ on June third.
2. He ______at a map at _______ on June third.
3. He ______to a picture at _______ on June third.
4. He ______Jenny at ______ on June third.
5. He ______ with a ball at ______ on June third.
下列哪些合同既属于双务合同,又属于有偿合同?()
A.买卖合同
B.借贷合同
C.租赁合同
D.付有保管费的保管合同