建设项目环境影响预测一般分为两个时段，指的是（）。
A.丰、枯水期
B.冬、夏两季
C.春、秋两季
D.施工时段和运营时段
参考答案：A, B
In relation to the Labour Contract Law of China:
(a) explain the circumstances that make a labour contract invalid or partially invalid in the process of concluding it; (3 marks)
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