可提高婴儿出生后局部免疫屏障的是() A.IgA B.IgG C.IgM D.IgD 发布时间:2017-06-11 22:47 │ 来源:www.tikuol.com 题型:单项选择题 A1/A2型题 问题: 可提高婴儿出生后局部免疫屏障的是()A.IgAB.IgGC.IgMD.IgDE.IgE
题型:单项选择题 A1/A2型题 Choose and fill in the blanks. 选择适当的疑问词填空。 how what who where when1. — is she doing? —She is reading English. 2. — does Tim go to Canada? —By plane. 3. — do you usually eat lunch? —I usually eat lunch at twelve. 4. — is Dingding? —He is beside the tree. 5. — is the girl in red hat? —She is my cousin. 查看答案
题型:单项选择题 A1/A2型题 直接写出得数.90÷3=12×4=68÷2=200+3000=80-46=77÷7=50×3=5600-600=54+36=42+35=14+24=4000+3000=37+25=69÷3=310+610=10000-4000= 查看答案
题型:单项选择题 A1/A2型题 如图所示为一磁流体发电机示意图,A、B是平行正对的金属板,等离子体(电离的气体,由自由电子和阳离子构成,整体呈电中性)从左侧进入,在t时间内有n个自由电子落在B板上,则关于R中的电流大小及方向判断正确的是( )A.I= ,从上向下B.I= ,从上向下C.I= ,从下向上D.I= ,从下向上 查看答案