【单选题】下列关于T、B细胞相互作用的描述错误的是
A.
辅助性 T 细胞产生可溶性细胞因子诱导 T 、 B 细胞的增殖
B.
辅助性 T 细胞识别的抗原表位与 B 细胞识别的抗原表位不同
C.
辅助性 T 细胞只有与 B 细胞直接接触才能诱导它增殖
D.
活化的 T 细胞表达 CD40L ,为 B 细胞提供活化的第二信号
E.
活化的 B 细胞表达 B7 ,为 T 细胞提供活化的第二信号
【单选题】To improve the quality of our products ,we asks for suggestions had used the products.
【单选题】To improve the quality of our products, we asked for suggestions _____ had used the products. [ ]
【单选题】The steady rise in the quality of our products ______ the improvement of our equipment.
【单选题】To improve the quality of our products, we asked for suggestions _____ had used the products.
【简答题】正常成人腋下温度为36-37摄氏度,口腔温度为37-37.5摄氏度。
【单选题】To improve the quality of our products, we asked for suggestions ________ had used the products. [ ]
【单选题】若栈采用顺序存储结构,正常情况下,删除栈中一个元素,栈顶指针top的变化是( )。
【单选题】若栈采用顺序存储结构,正常情况下删除栈中一个元素,栈顶指针top的变化是( )。