问题
多项选择题
在样品采集所加固定剂中，对于测定某些项目所加的固定剂要做空白试验，如测微量元素时就必须确定固定剂可引入的待测元素的量，如酸类会引入不可忽视量的（）等元素。
A、砷
B、铅
C、汞
D、硒
答案
参考答案：A,B,C
搜题请搜索小程序“爱下问搜题”
在样品采集所加固定剂中，对于测定某些项目所加的固定剂要做空白试验，如测微量元素时就必须确定固定剂可引入的待测元素的量，如酸类会引入不可忽视量的（）等元素。
A、砷
B、铅
C、汞
D、硒
参考答案：A,B,C
完型填空 （本题共10小题，每小题1分，共10分） Do you like going to the movies? Most of the in high schools like movies very much. Last Sunday I went to a school and asked some students their favorite movies. of their answers were really interesting. Here are their likes and : Jim, a boy, likes watching thrillers(恐怖片)because they are scary exciting. His classmate, Kate can’t stand documentaries(纪录片). She told me they were parents. But she really likes comedies because they are funny. Jack is a big boy. He said he mind documentaries. But he doesn’t like comedies they are boring! And the coolest movies are action movies. Everyone them very much!
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