Which Ig can pass through placenta:
A. IgM
B. IgA
C. IgG
D. IgE
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Which of the following can neutralize HBV particle? ( )
A. HBsAg
B. HBsAb
C. HBeAg
D. HBcAb
Which tumor marker can be used as a marker for gestational trophoblastic disease?( )
A. HCG
B. CA153
CA125
D. CEA
Which tumor marker in the following is the BEST one for hepatocellular cancer? ( )
A. CEA
B. AFP
Cancer Antigen 125 (CA-125)
D. Carbohydrate Antigen 19-9 (CA19-9)
表单构成中的表单控件、提示信息和表单域是什么?请具体解释。