当前 ,初中化学奥赛中考查实验知识与技能主要有以下几种题型 :一、基本操作题这类题的主要特点是 ,既考查常见仪器的主要规格及其使用 ,又考查实验操作 ;既考查对正确操作的了解 ,又考查对错误操作的辨认 .例 1　拟在加热条件下于烧杯中配制某溶液 5 0毫升 ,选择烧杯的规格应 At present, there are mainly the following types of questions in junior high school chemistry Olympic Games examination of experimental knowledge and skills: First, the basic operating questions The main features of these questions is to examine the main specifications of common instruments and their use, but also to examine the experimental operation; To understand the correct operation, but also examine the identification of the wrong operation. Example 1 In the beaker under the heating conditions to prepare a solution of 50 ml, select the beaker specifications should be