单选题:老年人缺__________时,可能会影响钙、磷的吸收利用,可导致骨质疏松。

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题目内容:
老年人缺__________时,可能会影响钙、磷的吸收利用,可导致骨质疏松。 A.氟
B.铁
C.锌
D.铜

参考答案:
答案解析:

某以玉米为主食地区,人群中发现了身体裸露性皮炎,尤其是上下肢伸侧皮肤呈对称性皮炎,并伴有草莓舌、腹泻等症状,该情况很可能

某以玉米为主食地区,人群中发现了身体裸露性皮炎,尤其是上下肢伸侧皮肤呈对称性皮炎,并伴有草莓舌、腹泻等症状,该情况很可能是__________。A.癞皮病 B.

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The best title for the essay is__________.

The best title for the essay is__________.A.HR for HR B.The principles of HR C.T

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Which o{ the following is an example of a well--written perf

Which o{ the following is an example of a well--written performance standard?___

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Performance appraisal methods can be broadly classified as e

Performance appraisal methods can be broadly classified as either __________, or

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