网络计划的工期优化是寻求（）
A．最短工期时的资源均衡
B．最短工期的成本最少
C．计算工期满足要求工期
D．寻求总费用最低的工期安排
参考答案：C
The driver is very _______ He often drives his car_______ . [ ]
A. careful, careful
B. more careful, careful
C. carefully, carefully
D. careful, carefully
患儿男，生后2天，出生体重为2400g。因吸入性肺炎入院，入院时患儿呼吸急促，口唇稍发绀。即置于辐射保暖床上抢救。
该患儿吸氧的流量应选择每分钟为（）
A.1L
B.2L
C.3L
D.4L
E.5L
