当工程网络计划的计算工期小于计划工期时，关键工作的( )。
A．总时差为零
B．总时差均大于零
C．自由时差为零
D．自由时差均大于零
参考答案：B
George returned after the war, only ________ that his wife had left him.[ ]
A. to be told
B. telling
C. being told
D. told
慢性胰腺炎五联征指（）
A．腹痛、胰腺钙化、假性囊肿，脂肪泻、糖尿病
B．腹痛、胰腺钙化、胰腺脓肿、脂肪泻、糖尿病
C．呕吐、胰腺钙化、假性囊肿、脂肪泻、糖尿病
D．腹痛、呕吐、胰腺脓肿、脂肪泻、糖尿病
E．腹痛，呕吐，假性囊肿、脂肪泻，糖尿病
