某筛子的小时给矿量为80t/h，筛下量为10t/h，求该筛子的产率。

细筛操作时，筛子的给矿量一定要保持均匀稳定，不要超负荷给矿或过少给矿。 细筛操作时，筛子的给矿量一定要保持均匀稳定，不要超负荷给矿或过少给矿。 If there is a rainstorm on August 10th,program B will start on（）    The position of the 10th thoracic segment of spinal cord is at the level of（） Why didn"t Reagan take a bus to go to 10th and Sherman?__________ _____the morning of September 10th, we are going to give our teacher some flowers.[ ] 某台筛子每小时处理300吨烧结矿，其中含返矿150吨，实际筛下100吨，筛分效率是（）。 Using the standard normal curve, the z-score representing the 10th percentile is 1.28. I’m pleased to receive your letter of April 10th, ________ for our catalogue and price-list. US President Barack Obama ________ a national speech at the 10th anniversary of 9/11 terror attacks.[ ] Our school has the parents’ meeting _____ the afternoon of October 10th, and it starts _______3p.m. Our school will have the parents’ meeting _____ the afternoon of November 10th, and it will start _______3p.m. I’ m pleased to receive your letter of April 10th, __________for our catalogue and price-list. According to St. Bede, an English historian of the early 10th century, Easter was derived from the name Eostre. Ninety-six people lost theirlives in a plane crash on April 10th, 2010, _________the Polishpresident and his wife. Andy lives on the 10th floor. While his Uncle Jim lives 5 floors __________ in the same building. The conference was _______ fixed for the 10th, August, but later the unexpected landslide(泥石流) in Zhouqu in Gansu province, made us put it off 给矿量偏高时，促成筛上产量亦高，（）低。 随着给矿量的增加，细筛筛上产率也增加，筛分效率逐渐（）。 随着给矿量的增加，细筛筛上产率也增加，筛分效率逐渐（）