前轮定位包括（）、主销后倾、主销内倾、前轮前束四个内容。
A.前轮外倾
B.主销外倾
C.车轮内倾
D.主销前倾
参考答案：A
-Jim, what are you _______?
-A dog. It is playing with a ball on the floor.[ ]
A. looking for
B. looking at
C. looking like
D. looking up
三羧酸循环和丙酮酸异生生成糖的交汇点是
A．乙酰CoAB．丙酮酸C．草酰乙酸D．磷酸二羟丙酮
