BEIJING (AP) - Three years after a collision between an American spy plane and a Chinese fighter jet pushed relations to a new low, Beijing and Washington are squabbling over human rights, visa policies and U.S. weapons sales to Taiwan. This time, though, a delicate web of mutual self-interest - including fighting terrorism and encouraging trade - means both governments want to keep chronic disputes from spinning out of control as happened on April 1, 2001. The anniversary of the collision of the U.S. EP-3 surveillance craft and the Chinese J-7 fighter off southern China comes as the American and...