下列可用于区别抑郁症与恶劣心境的是（）
A.情绪低落
B.睡眠障碍
C.记忆力减退
D.有想死的念头
E.精神运动性抑制及幻觉妄想
参考答案：E
—These problems are too hard to ______. Will you give me some advice?
—There are many ways. The most important is to have a careful plan. [ ]
A. work out
B. look out
C. hand out
D. put out
在温度高的条件下，不应选用（）的润滑油（脂）。
A、黏度大
B、闪点高
C、凝固点低
D、油性好
