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【多选题】
原发性甲减的表现下列错误的是（）。A.
颈部疼痛
B.
Tg较敏感，特别是亚临床甲低
C.
先天性甲低的筛选以FT及高灵敏的TSH为最敏感的诊断指标
D.
甲状腺显像的功能状态减低
E.
早期吸碘试验减低
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反馈参考答案：
举一反三
【简答题】电液动换向阀是由( )和液动换向阀组成的复合阀。
【多选题】使用索氏提取器进行固液提取,下列观点正确的有:
A.
利用了溶剂回流及虹吸原理，固体物质反复被纯溶剂浸润、萃取，效率较高
B.
无需拆解装置，相当于多次回流连续进行，方便快捷
C.
浸润的固体必需用滤纸等包裹起来，避免细小固体颗粒浮出，堵塞虹吸管
D.
滤纸筒中的固体不要高过虹吸管，否则萃取效果不理想
【单选题】Economists normally assume that the goal of a firm is to:
A.
sell as many units of output as possible.
B.
maximize profits.
C.
sell products at the highest prices possible.
D.
maximize sales revenue.
【单选题】Economists normally
A.
do not try to explain people's tastes, but they do try to explain what happens when tastes change.
B.
believe that they must be able to explain people's tastes in order to explain what happens when tastes change.
C.
do not believe that people's tastes determine demand, so they ignore the subject of tastes.
D.
incorporate tastes into economic models only to the extent that tastes determine whether pairs of goods are substitutes or complements.
【单选题】Economists normally assume that the goal of a firm is to
A.
maximize its total revenue.
B.
maximize its profit.
C.
minimize its explicit costs.
D.
minimize its total cost.
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