王某为抗拒执行，把法院的执法人员打成轻微伤，致使执行工作无法进行。王某的行为不构成拒不执行判决、裁定罪，而构成妨害公务罪。
参考答案：对
Norman Bethune _____ for about 70 years. [ ]
A. has died
B. died
C. has been dead
D. was died
妊娠后半期羊水的主要来源是
A．膜的透析
B．膜的透析
C．胎儿尿液
D．带表面的透析
E．胎儿呼吸道黏膜的透析
