A：将盖玻片垂直于载玻片迅速放下
B：观察装片时可通过开大光圈来增加视野亮度
C：观察装片时发现物像在视野的左上方，应将装片向右下方移动
D：若视野中发现一污点，转动物镜此污点不动，则此污点一定在临时装片上
经过测算，地球的平均半径为（ ）
用下列词语造句
①授予
②崎岖
Hainan is in the of China.
We have _____ art teacher. He is ______ funny.
Only good swimmers can get to that place. There is water all ________ it.
