下列实验操作正确的是 

下列实验操作正确的是

 

答案

D

解析:略

 

相关题目

化妆品如果不开封,保存期可达三年左右,一旦开封,都很
化妆品如果不开封,保存期可达三年左右,一旦开封,都很容易坏掉,不但效果大打折扣,甚至会伤害皮肤。针对这点,精明的商家推出了小巧的化妆
 Maria is        in the internet, and internet makes her life more   
 Maria is        in the internet, and internet makes her life more          .              A. iteresting; interested        B.interested; interested        
 He became an actor at a very young age but it was nearly 20 years ______ he b
 He became an actor at a very young age but it was nearly 20 years ______ he became famous.     A. until                       B. when                    
下列事例中,一定发生了化学变化的是(   ) A.瓷碗摔碎
下列事例中,一定发生了化学变化的是(   ) A.瓷碗摔碎了B.潮湿的衣服晒干了C.桌子上的苹果腐烂了D.冰箱中的水结冰了
已知双曲线与椭圆共焦点,它们的离心率之和为,求双曲线
已知双曲线与椭圆共焦点,它们的离心率之和为,求双曲线方程.
关于骨骼肌的叙述中,不正确的一项是(    )。A.每块
关于骨骼肌的叙述中,不正确的一项是(    )。A.每块骨骼肌都至少跨越一个关节B.每块骨骼肌全部都是由肌肉组织构成的C.每块骨骼肌都包括了
I was born there and have known that old museum________ I was very young.  
I was born there and have known that old museum________ I was very young.       A.for              B.since           C.because         D.so
右图给出了一个“三角形数阵”。已知每一列数成等差数列
右图给出了一个“三角形数阵”。已知每一列数成等差数列, 从第三行起,每一行数成等比数列,而且每一行的公比都相等,          记第行第列

最新题目