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【多选题】
压电陶瓷包括( )特性A.
采用压电陶瓷制作的压电传感器灵敏度都非常高
B.
极化处理后的压电陶瓷材料的剩余极化强度和特性与温度有关, 它的参数也随时间变化, 从而使其压电特性减弱
C.
目前使用较多的压电陶瓷材料是锆钛酸铅, 它是钛酸钡和锆钛酸铅组成，有较高的压电系数和较高的工作温度
D.
压电陶瓷的压电系数比石英晶体小
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【简答题】Listening 1 Popularity of different entertainment media Carol Day’s class done a survey in their year into the popularity of different kinds of entertainment media. Here, Ms Day is telling her class a...
【单选题】On ______ April Fool’s Day, some of the naughty boys in our class played _____ trick on the new teacher. [ ]
A.
the; a
B.
the; 不填
C.
不填 ; a
D.
不填；不填
【多选题】以下哪个是医学专业搜索引擎( )
A.
http://www.yahoo.com
B.
http:// www.alltheweb.com
C.
http://www.hon.ch
D.
http://www.medmatrix.org
【简答题】完形填空。 Carol and Susan were great friends. They were in the same class at __ 1 __ , and they often played together after school. When Carol was eight years __ 2 __ , her mother had a baby. Carol was __...
【单选题】改变当前网页网址http://www.yahoo.com的语句是
A.
window.location.href = "http://www.yahoo.com";
B.
window.address.href = "http://www.yahoo.com";
C.
window.address = "http://www.yahoo.com";
D.
window.href = "http://www.yahoo.com";
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