骨折患者的现场急救（）。
A.简单了解受伤经过
B.进行全身仔细检查
C.包扎伤口
D.妥善固定
E.平稳运送
参考答案：A, C, D, E
When I reach the school grounds there are lots of "good mornings" _____ me _____ the boys, many _____
whom have walked a long way, sometimes up _____ two hours, to get to the school. [ ]
A. to; of; from; for
B. of; from; for; to
C. from; for; to; of
D. for; from; of; to
为减少线路阻塞，保证接通率，提高工作效率，用户交换机中继线的数量应不少于交换机容量的（）。
A.10%
B.20%
C.30%
D.50%
