大量咯血指的是().
A.每日咯血量100ml
B.每日咯血量200ml
C.每日咯血量300ml
D.每日咯血量在500ml以上
E.一次咯血量80ml
参考答案:D
There were a lot of computers at the exhibition, to my satisfaction, _______ of which would have suited me perfectly.
A.none
B.either
C.any
D.neither
指示标志的作用是什么?
A.限制车辆、行人通行
B.指示车辆、行人行进
C.告知方向信息
D.警告前方危险