A:向稀硝酸中加入铁粉
B:向稀盐酸中滴入少量的NaAlO2溶液
C:向NaOH溶液中通入CO2气体
D:向MgSO4、H2SO4的混合溶液中加入过量的Ba(OH) 2溶液
When she saw an old woman ____ (lie) on the side of the road, she called 120 at once.
The People's Republic of China was f____ in 1949.
我能辨别下列形近字,并组词。
鹂____ 间____
骊____ 涧____
“五一”节期间,某电器按成本价提高30%后标价,再打8折(标价的80%)销售,售价为2080元.设该电器的成本价为x元,根据题意,下面所列方程正确的是( )
数数木块的个数,有____块.