动槽式水银气压表须自下而上调整水银面,目的是为了使水银柱顶保持正常的弯月面,以消除( 发布时间:2017-11-10 17:39 │ 来源:www.tikuol.com 题型:单项选择题 问题: 动槽式水银气压表须自下而上调整水银面,目的是为了使水银柱顶保持正常的弯月面,以消除()。A.滞后误差B.习惯误差C.条件误差D.趋势误差
题型:单项选择题 在天平两托盘的烧杯中,分别放有足量的等质量、等质量分数的硫酸,天平平衡.向天平左端的烧杯中加入4.4g氧化铁,欲保持天平平衡,应向右端的烧杯中加入( )A.4.3g锌B.4.8镁C.2.3g钠D.5.4g铝 查看答案
题型:单项选择题 — How could you _____ your friend so easily? — She is the kind of person who _____ in a crowd. [ ]A. pick out; stands out B. make out; stands for C. take out; stands by D. bring out; stands aside 查看答案