High school students sleep in____ (宿舍) when they study at school.
1−310 =____
14+15 =____
14−15 =____
38+14 =____
56−13 =____
23−29 =____
-Didn't you see the sign "No parking!" on the right?
-Sorry, I didn't. But now I know parking ____________ here.
①0.7____0.5 ②0.6____1.3
NaOH起始读数
NaOH终点读数
第一次
0.10mL
18.60mL
第二次
0.30mL
18.00mL
下列国家中属于发达国家的是( )