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问题 单项选择题

佝偻病激期主要临床表现是

A．睡眠不安，夜惊
B．烦躁多哭，多汗
C．突然抽搐，重者可突然窒息
D．骨骼系统改变
E．动作与语言发育迟滞

答案

参考答案：D

解析：早期维生素D缺乏的婴儿未经治疗，继续加重，出现PTH功能亢进，钙、磷代谢失常的典型骨骼改变。

单项选择题

Many students agreed to come, but some students against because they said they don’t have time.

A. did not because they say they did not
B. were against because they say they don’t
C. did not because they said they did not
D. were against coming because they said they don’t
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单项选择题

HH-Ⅰ型钻进式井壁取心器的技术规范中，液压马达转速为（）。

A、3000r/min

B、2800r/min

C、2400r/min

D、2000r/min
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