踩踏制动踏板感到有弹性,表明液压制动系统中有空气渗入。
参考答案:对
保护性抗体是()
A.HBsAg
B.抗HBc
C.HBeAg
D.抗HBe
E.抗HBs
Here is my family.
A.a photo of
B.photo of
C.a photo at
D.photo at