化简：（1）2x2﹣3x2=（ ）；
（2）2n+2n=（ ）．
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Once upon a time there were two brothers who lived near each other. One day, they had a 16 because of some small things. And neither was willing to 17 each other. One morning, there was a knock at door of the elder brother. He 18 it and found a man standing beside the door. “I’m a carpenter(木匠). I’m 19 a few days’ work. Perhaps you would have a few small jobs I could help with.” “Yes,” said the elder brother. “I do have a job for you. 20 at that farm across the small river. It is my younger brother’s. We had a quarrel, so I won’t like to see his 21 any more. I want you to build me a 8-foot 22. ” The man said, “I think I understand the situation. Don’t worry. I’ll be able to do a job that makes you 23” So the elder brother was very glad and left for the town nearby. In the evening, the carpenter had just 24 his job when the elder brother returned. But he was 25 to find, instead of a fence, before him, stood a 2 6, which went from one side of the river 27 the other! On the other 28 of bridge, was his younger brother. “Do you know the name of the bridge?” The carpenter asked. “No,” the elder brother was 29 “OK, I can tell you. Its name is understanding and 30,” the carpenter smiled. Suddenly they began to understand 31. Surely, between two brothers there should be a bridge rather than a 32. Standing on the bridge, they 33each other’s hands with 34 in their eyes. “Could you stay another few days? I’ve a lot of other work for you,” said the elder brother. “I’d love to 35 on,” the carpenter said. “But I have many more bridges to build.”
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单相交流母线的颜色是（）。
A、黄色
B、绿色
C、红色
D、与引出相颜色相同
依法认定为假药的是（）
A.未表明有效期的药品
B.不良反应大的药品
C.以他种药品冒称此种药品
D.有禁忌证的药品
E.因药品包装不方便医疗使用的药品
在有关神经调节的叙述中，全部正确的一组是（）
A.兴奋传导是从一个神经元的树突传给下一个神经元的轴突或细胞体
B.饮酒过量的人表现为语无伦次、走路不稳，主要因为脊髓和脑干的功能受影响所致
C.兴奋在神经纤维传导的方向与膜内电流方向相同，即由兴奋部位流向未兴奋部位
D.兴奋在神经纤维传导是双向的，因此反射弧中传入神经和传出神经共用同一根神经纤维
患者，黄某，男性，28岁，汽车撞伤致右大腿肿痛、流血、畸形2h。主诉右肢疼痛，以大腿处为著，流血、不能活动。查体：T36.7℃，Pll5/min，R21/min，BPll0/25mmHg，一般情况尚可，烦躁不安，急性痛苦面容，被动卧位。见右大腿中段肿胀，呈屈曲外旋畸形，因剧痛拒绝查体，外侧可见3cm长的裂口，有鲜血流出。可见骨折端，患肢活动受限，右足背动脉搏动存在，各趾运动灵活，感觉正常。其余未发现异常。
如果该患者骨折不愈合，下列哪项原因是错误的（）
A.粉碎性骨折
B.未用抗生素
C.骨膜损伤
D.年老
E.骨折局部感染