下列哪种现象为血尿（）
A.乳白色尿液混有血液
B.淡黄色尿
C.深黄色尿
D.尿中有红细胞，外观淡棕红色
E.尿中无红细胞，外观浓茶或酱油色
参考答案：D
When a man who has fallen overboard is being picked up by a lifeboat，the boat should approach with the wind（）.
A.astern and the victim just off the bow
B.ahead and the victim just off the bow
C.just off the bow and the victim to windward
D.just off the bow and the victim to leeward
已知函数y=x2,在[-1，1]展开的傅立叶级数为，可得=（）。
A.A
B.B
C.C
D.D
，可得
=（）。