老年痴呆的后期主要表现为（ ）
A．生活不能自理
B．幻觉
C．妄想
D．远记忆障碍
E．智能全面减退
参考答案：A
Driving on the road, drivers do ______ the traffic rules, which is responsible for themselves
as well as others.
A．see
B．watch
C．observe
D．notice
气割切割速度与工件厚度和（）有关。
A.割嘴形状
B.切割氧的压力
C.预热火焰能率
