- What do you want to be when you grow up?-I want to be_______ social worker. Many people are in great need of our help.
A:a
B:an
C:the
D:不填
读拼音,写词语。
jùn xiù____ jí yóu____
càn làn____ zǒnɡ tǒnɡ____
yóu lǎn____ ɡōnɡ jiànɡ____
已知a→=4,e→为单位向量,当a→,e→的夹角为2π3时,a→+e→在a→-e→上的投影为( )