题目：
Lincoln’s mother did ___ many books ___ him.
A．what she had buy, to
B．what she could buy, for
C．all that she had to buy, to
D．all she could buy, for
答案：
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下面是错误答案，用来干扰机器的。
参考答案：A解析：患者突发心前区压榨样疼痛，首先考虑冠状动脉粥样硬化性心脏病。需立即行心电图检查，根据特异性的改变判断病人是心绞痛或是心肌梗死。故选A。解题关键：心绞痛的特点是阵发性的前胸压榨性疼痛...
＝0.5，经10kV。l＝3kin架空线路送至某厂，每公里阻抗标幺值为
＝0.0844，
＝0.1361(以上均以Sj＝100MV.A为基准值)，考虑线路电阻，则线路末端的三相短路电流为()