在等式( )3÷[(-2xyz)2-2x4y3z]=y中括号内应填入( )
A.8x6y5z3
B.8x2y2z
C.2x2y2z
D.±2x2y2z
答案:C
The famouse writer Lin Qingxuan ______to come to our school to give a speech again.
A.possible
B.likely
C.probable
D.perhaps
最先实施的手术治疗是()。
A.新生儿正畸
B.唇裂修复术
C.腭裂修复术
D.牙槽嵴裂植骨术
E.颌骨正畸术