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以下关于化学实验中“先与后”的说法中不正确的是[ ]

A．加热试管时，先均匀加热，后集中加热

B．用排水法收集气体后，先移出导管后撤酒精灯

C．制取气体时，先装药品后检验装置气密性

D．称量NaCl固体时，先在两个托盘上各放一张完全相同的纸，再加药品

答案

答案：C

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At 16, I left home to do part-time jobs, _______ made me understand 小题1:_________

“East or west, home is the best” b_______ than before.At that time I 小题2:_________

thought _____ (呆) at home was boring because my parents were always 小题3:________

t_______ me what to do and what not to.So when the chance came,     小题4:_________

I left home and washed d_________ at a restaurant.Things were not so小题5:_________

easy for me.My hands became frozen because of cold.B________,     小题6:_________

some _______ (顾客) were quite particular.They always scolded me. 小题7:__________

I f_______I had dropped from heaven.When I talked with my parents 小题8:_________

on the phone, tears rolled down my cheeks.Since _________ I have 小题9:__________

_________ (意识) that home is my shelter and parents are great.小题10:_______
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