如图,将△ABC绕点A逆时针旋转80°得到△AB′C′.若∠BAC=50°,则∠CAB′的度数为()
A:30°
B:40°
C:50°
D:80°
Emmanuel Macron (born on 21 December 1977),
is a French politician(政治家).He was elected(选举)to be the new president of France on May 7,2017.
And his wife used to be his teacher, and she is 64 years old now.
依据达尔文进化论的观点,人类起源于( )
在探究“电流与电阻的关系”的实验过程中,小明选择了5Ω、10Ω、20Ω、25Ω五个电阻进行实验,电路图如图甲所示.