单项选择题

What is time preference?
A、People prefer the present consumption.
B、People prefer the future consumption.
C、Compared with the future consumption people prefer the present consumption.
D、Compared with the present consumption people prefer the future consumption.

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单项选择题

A3/A4 题型男性,67岁,咳嗽、痰中带血丝2个月,发热10天。胸片显示右肺上叶片状阴影,呈肺炎样征象,患者一个月后出现右侧面部无汗、瞳孔缩小、上眼睑下垂及眼球内陷。复查胸片显示右胸顶部致密块影。诊断最可能是
A、转移性肺癌
B、中央型肺癌
C、粟粒性肺结核
D、纵隔淋巴肉瘤
E、Pancoast肿瘤

单项选择题

有机磷中毒原理
A.
使胆碱酯酶活性增加 B.
抑制呼吸中枢 C.
直接作用于中枢神经 D.
使乙酰胆碱在体内蓄积