题目内容

咳铁锈色痰常见于

A. 急性左心衰竭
B. 支气管扩张
C. 肺炎球菌肺炎
D. 肺结核
E. 肺脓肿

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大量咯血患者咯血量是

A. ＜50ml/日
B. ＜100ml/日
C. ＜300ml/日
D. 100ml -500/日
E. ＞500ml/日或100-500 ml/次

乒乓球右手正手攻球正确的用力方向是（0.

A. 左侧前上方
B. 右侧前上方
C. 由上向下方
D. 由下向侧方

The transformer receives on the primary winding an AC voltage and delivers on the secondary winding a different DC voltage(a lower one)

A. 对
B. 错

Voltage regulators are circuits designed to maintain the output of power supplies at constant amplitude despite variations of the AC source voltage or changes of the resistance of the load.

A. 对
B. 错