黑洞的转速可以达到每秒5000转,加上其巨大的质量,就形成了时空漩涡。
参考答案:对
某建筑基槽宽5m,长20m,开挖深度为6m,基底以下为粉质黏土。在基槽底面中间进行平板载荷试验,采用直径为800mm的圆形承压板。载荷试验结果显示,在p-s曲线线性段对应100kpa压力的沉降量为8mm。试问:基底土层的变形模量E0值最接近下列()项。()
A.4.75MPa
B.6.72MPa
C.8.96MPa
D.12.30MPa
B Egyptian Villages 埃及村落
Most of the inhabitants live in mud-brick homes, their (1) walls insulating against the afternoon heat. Flat roofs, exposed (2) the northern evening breezes, serve as cool sleeping (3) as well as storage areas. Villagers plaster the outer walls (4) often trim them in blue, a color they believe (5) off the evil eye. As a man becomes richer, (6) can add a second story to his house perhaps (7) his married son. Those villagers who have made the (8) to Mecca paint the legend of their trip on (9) outer walls of their homes. Such hajj houses, along (10) the mosques, are the most distinguished buildings in a (11)
Some villagers build ornate pigeon coops close to their (12) , using the birds as food and their droppings to (13) crops. Many houses still have dirt floors and lack (14) or running water; women with jars balanced on their (15) make the trek to the community well, and children donkeys haul the (16) liquid in jerry cans.
All (17) said, government sponsored building programs have also brought newer (18) residences and utilities to some villages, particularly those outside (19) Nile Valley in the Oases and the Red Sea (20) areas.
16.()