问题
选择题
下列实验基本操作中正确的是（ ）
A．给试管里的固体加热时，试管应与桌面成45°角
B．稀释浓硫酸时，应将水沿器壁慢慢倒入浓硫酸中，并不断搅拌
C．用剩的药品应该交还实验室，不可抛弃，也不可放回原瓶
D．将固体氢氧化钠放在托盘天平左盘的纸上称量
答案
答案：C
搜题请搜索小程序“爱下问搜题”
下列实验基本操作中正确的是（ ）
A．给试管里的固体加热时，试管应与桌面成45°角
B．稀释浓硫酸时，应将水沿器壁慢慢倒入浓硫酸中，并不断搅拌
C．用剩的药品应该交还实验室，不可抛弃，也不可放回原瓶
D．将固体氢氧化钠放在托盘天平左盘的纸上称量
答案：C
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| Two brothers worked together on a farm. One was married and had a large 1 . The other had no wife yet. Although they lived in different houses, they shared everything they got from their farm. One day, the single brother said to himself, "It's not 2 that we share all the rice. I'm 3 and I need less than my brother." So, every night he took a bag of rice from his store-room and 4 across the field 5 their houses, putting it into his brother's store-room. At the same time, the married brother thought, "It's not fair to share all the rice. I'm married and I have my wife and children to 6 me when I am 7 . However, my brother has no one to take care of his 8 " So, each night he also took a bag of rice and put it into his brother's store-room. Several months passed by. They found 9 strange that their rice never became less. Then, one dark night the two brothers ran into each other. Slowly they began to understand what was happening. Their bags fell onto the ground and tears 10 their eyes at once. | ||||
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