严格执行煤层注水、()、()、()、地面岩移观测、加强支护及“预测、治理、检验、防护”的综合防冲措施。
参考答案:坚硬顶板断顶卸压;大孔径钻孔卸压;放炮卸压
在接合过程中,供体细胞与受体细胞是怎样彼此联系的?
The house was situated on a hill over the village.()
A. above the village
B. beyond the village
C. under the village
D. within the village