问题
多项选择题
下列叙述属于系统误差的是（）。
A、砝码长期使用后重量有改变
B、选用的试剂不纯
C、室温、气压、湿度等的变化
D、操作人员对终点颜色敏感性认识不同
答案
参考答案：A,B,D
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下列叙述属于系统误差的是（）。
A、砝码长期使用后重量有改变
B、选用的试剂不纯
C、室温、气压、湿度等的变化
D、操作人员对终点颜色敏感性认识不同
参考答案：A,B,D
| 完形填空。 | |||
| On the first day of school, Cothren, a teacher, did something not to be forgotten.With the __1__ of the school principal, she took all of the desks out of the classroom. The kids came into the first period. They walked in, but there was nothing in the classroom. They __2__ looked around and said,"Ms. Cothren, where are our __3__?" And she said,"You can't have desks until you tell me how you earn them." They thought,"Well, maybe it's our __4__." "No, "she said. "Maybe it's our good behavior." And she told them,"No, it's not even your __5__ behavior." And so they came and went in the first period, still no desks in the __6__. Second period, the same thing. Third period. __7__ the early afternoon television news reporters had __8__ in Ms. Cothren's class to find out about this __9__ teacher who had taken all the desks out of the classroom. The last period of the day, Cothren gathered her __10__. They were at this time sitting on the __11__ around the sides of the classroom."Throughout the day no one has really __12__ how you earn the desks."She said,"Now I'm going to __13__ you." Cothren went over to the door and opened it, and as she did some soldiers __14__ into the classroom, each one __15__ a school desk. They placed those school desks in rows. And by the time they had finished __16__ those desks, those kids for the first time in their lives understood how they __17__ those desks. Cothren said __18__, "You don't have to earn those desks. These guys did it for you. They put them out there for you, but it's up to you to sit here to be __19__ for learning, to be good students and good citizens, because they __20__ a price for you to have these desks, and don't ever forget it." | |||
| ( )1.A.satisfaction ( )2.A.obviously ( )3.A.desks ( )4.A.characters ( )5.A.violent ( )6.A.hall ( )7.A.By ( )8.A.reported ( )9.A.intelligent ( )10.A.students ( )11.A.cushion ( )12.A.learned ( )13.A.punish ( )14.A.walked ( )15.A.dragging ( )16.A.leaving ( )17.A.made ( )18.A.coldly ( )19.A.responsible ( )20.A.agreed | B．permission B．calmly B．chairs B．hobbies B．excellent B．dormitory B．In B．gathered B．attractive B．friends B．sofa B．identified B．scold B．broke B．carrying B．moving B．traded B．impatiently B．anxious B．paid | C．anxiety C．regretfully C．erasers C．marks C．individual C．ground C．On C．wandered C．crazy C．colleagues C．floor C．recognized C．tell C．rushed C．pulling C．placing C．repaired C．angrily C．cautious C．offered | D．praise D．doutfully D．pens D．services D．aggressive D．classroom D．At D．discussed D．severe D．assistants D．bench D．understood D．remind D．ran D．reaching D．returning D．earned D．sincerely D．necessary D．fixed |