设3元非齐次线性方程组Ax=b有解α1,且r(A)=2,则Ax=b的通解是
A、《中外合资经营企业法》
B、《进出口商品检验法》
C、《海关法》
D、《对外贸易法》
Youshouldtrytowrite__________evenwhenyou’rebusy.Asyouknow,practicemakesperfect.
A、nowandthen
B、moreorless
C、soonerorlater
D、hereandthere
Weneedfriendsto________,orwewillfeellonely.
A、chat
B、chatto
C、dance
D、danceto
Willyou_________playingbasketball?
A、joinusin
B、jointo
C、joinusto
D、tojoinus