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SKI£400型异构化催化剂是以氧化铝、沸石为担体的载铂双功能催化剂,沸石为异构化催化剂提供的功能是()。
A.金属
B.酸性
C.裂解
D.加氢
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A.金属
B.酸性
C.裂解
D.加氢
In 1963, a Grade 8 student named Tom Sims【C4】______ a ski-board for a school project in New Jersey. Then in 1966, a man named Sherman Poppen【C5】______ two skis together for his kids on Christmas day. He called his invention "the Snurfer," which 【C6】______ the words "snow" and "surf". In 1969, Jack Burton Carpenter received a【C7】______for Christmas. He soon began designing boards, and today "Burton" is a popular【C8】______of snowboard.
By the 1980s, snowboarding had become very popular.【C9】______, most ski resorts did not allow snowboarding because they thought it was too【C10】______. Since many snowboarders were young, many older skiers did not want them on the ski hills. The snowboarders had to go to the backcountry, 【C11】______ patrolled (有巡逻的) resorts.
Rejection at the resorts did not【C12】______snowboarding from growing in popularity. Eventually, the owners of ski resorts changed their views. They 【C13】______that they could make more money by allowing snowboarding. One by one, the resorts【C14】______ to welcome snowboards. Today, many resorts even set【C15】______special areas where snowboarders can practice their creative tricks.
【C1】
A.spreading
B.popular
C.ordinary
D.interesting
XFG-7型高频信号发生器输出400KHZ的正弦波,“调幅选择”钮应放到“400”档位。()