用一对6米吊索吊一物体，两吊点相距6米，吊索与吊钩垂线夹角（）。
A、15°
B、30°
C、45°
参考答案：B
We have gathered nearly 100,000 quilts, up to half have gone to the flood-hit areas.
A．of which
B．in which
C．with which
D．for which
慢性淋巴细胞白血病下列哪项核型异常患者预后较好
A．+12
B．+12伴结构异常
C．14q
D．13q14
E．14q32
