实验室配制500mL 0.1mol/L的Na2SO4溶液,实验操作步骤有:
A.继续向容量瓶中加蒸馏水至液面距刻度线1~2cm处,改用胶头滴管小心滴加蒸馏水至溶液凹液面最低处与刻度线相切.
B.把制得的溶液小心地转移到容量瓶中.
C.在天平上称出7.1g硫酸钠固体,把它放在烧杯中,用适量的蒸馏水使它完全溶解并冷却至室温.
D.用少量蒸馏水洗涤烧杯和玻璃棒2~3次,每次洗涤的液体都小心注入容量瓶,并轻轻振荡.
E.将容量瓶瓶塞塞紧,充分摇匀.请填写下列空白:
如图,从一艘船上测得一个灯塔的方向是北偏西47°,那么这艘船在这个灯塔的( )
海水 →①浓缩 浓缩海水 →②氯气 溴、海水 →③鼓入热空气或水蒸气 溴蒸气 →④冷凝 粗溴
根据句意及首字母或汉语提示完成单词
(1)Anna washes her f____ after she gets up in the morning.
(2) I like this book very much because it is very i____.
(3)There are sixty m____ in an hour.
(4)I go to the ____ (公园) with mum every evening.
(5)My father is very ____ (忙的) these days.
A. Look at the duck. It is short and fat.
B. The pig has a fat body and big ears.
C. Look! They're Lucy and Lily. T Lucy is from Australia. Lily is from Canada.
D. Mr White is my teacher. He's from the USA.
E. This is Amy, She's my sister. She's a pupil.
⑴ ____
⑵ ____
⑶ ____
⑷ ____
⑸ ____