I hate people _______ talk much but do little.[ ]
A. whom
B. whose
C. which
D. who
答案:D
下列计算正确的是( )
A.a2·a3=a6
B.a3÷a=a3
C.(-a2)3=-a6
D.(-2a2)4=8a8
颌面部脓肿切开引流的原则中,哪项可除外
A.切口靠近脓肿最低位
B.切口尽量与皮纹方向一致
C.尽量采用隐蔽切口
D.切口尽量避开血管神经
E.常规采用放射状切开