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问题 单项选择题

3个月小儿，查体见口唇及睑结膜稍苍白，红细胞3.0×1012/L血红蛋白110g/L该患儿可能是

A．感染性贫血
B．营养性巨幼细胞性贫血
C．生理性贫血
D．缺铁性贫血
E．再生障碍性贫血

答案

参考答案：C

多选题
如图所示，理想变压器的原副线圈匝数比n1：n2=1：10，副线圈与阻值R=20Ω的电阻相连．原线圈两端所加的电压u=20sin20πt(V)，则（　　）

A．副线圈输出交流电的频率为10Hz

B．交流电压表的示数为20V

C．电阻R上消耗的电功率为2kW

D．原线圈中电流的最大值为100A
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单项选择题

Residents of an apartment complex are considering two possible plans for collecting recyclable trash. Plan 1—Residents will deposit recyclable trash in municipal dumpsters located in the parking lot. The trash will be collected on the first and the fifteenth days of each month. Plan 2—Residents will be given individual containers for recyclable trash. The containers will be placed at the curb twice a week for trash collection.
Which of the following points raised at a meeting of the residents, if valid, would most favor one of the recycling plans over the other

A．Residents will be required to exercise care in separating recyclable trash from nonrecyclable trash.

B．For trash recycling to be successful, residents must separate recyclable bottles and cans from recyclable paper products.

C．Penalties will be levied against residents who fail to sort their trash correctly.

D．Individual recycling containers will need to be made of a p and durable material.

E．(E) Recyclable trash that is allowed to accumulate for two weeks will attract rodents.
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