某抽提装置返洗液流量为10t/h，进料流量为30t/h，进料芳烃含量为70％（质量分数），则返洗比为（）

Why didn"t Reagan take a bus to go to 10th and Sherman?__________ 抽提返洗液中烯烃高时，应（） 某抽提装置进料流量为50t/h，设计处理量为55t/h。则该装置的负荷率为（） It was July 24th when he arrived in London, ______ the 30th Olympic Games would be declared open 3 days later. 精馏塔饱和蒸汽进料，则精馏段回流液流量与提馏段下降液体流量相等（） 13 ___ had they reached the 30th floor ____ they realized that they had forgotten to take the key _____the morning of September 10th, we are going to give our teacher some flowers.[ ] It’s suggested that some activities to celebrate the 30th anniversary of the Reform and Opening-up. 抽提汽提塔发泡时，返洗液中会夹带大量（） Using the standard normal curve, the z-score representing the 10th percentile is 1.28. The 30th Olympic Games, ______ between July 27 and August 12 in 2012, will take place in London[ ] What advantages do you think London ________other cities in hosting the 30th Olympic Games? 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. US President Barack Obama ________ a national speech at the 10th anniversary of 9/11 terror attacks.[ ] I’ m pleased to receive your letter of April 10th, __________for our catalogue and price-list. I’m pleased to receive your letter of April 10th, ________ for our catalogue and price-list. The 30th Olympic Games, _______ between July 27 and August 12 in 2012, will take place in London. How long will it be ________ the 30th Olympic Games is held in London? —It won’t be two years, I think The moment the people of London heard that their city had won the bid for the 30th Olympic Games, they ________ cheers.