CPE常常作为鉴定病毒的依据之一,CPE的含义是什么()
A.病毒特异性染色
B.病毒变异效应
C.细胞特异性染色
D.细胞病变效应
E.细胞吸附病毒特性
参考答案:D
—The two old friends were ____ busy ____ with each other that they forgot the time.
—Yes. They hadn’t met for over ten years, so they kept talking the whole night.
A.too, to talk
B.too, talking
C.so, to talk
D.so, talking;
在磁场中通电线圈会产生旋转,其旋转方向取决于线圈中的().
A.电流方向
B.磁场方向
C.电流方向和磁场方向
D.电阻大小