下列关于细胞工程的叙述,不正确的是( ) A.电刺激可诱导植物原生质体融合或动物细胞融合 B.去除植物细胞壁和将动物组织分散成单个细胞均
补写出下列名句名篇中的空缺部分。(任选3题,多选只按前3题计分。)(6分) (1)河内凶, , ;河东凶
设球O的半径是1,A、B、C是球面上三点,已知A到B、C两点的球面距离都是,且三面角B-OA-C的大小为,则从A点沿球面经B、C两点再回到A点的最短距离是 A.
某地区的年降水量在下列范围内的概率如下表所示:年降水量(单位:mm)[100,150)[150,200)[200,250)[250,300)概率0.120.250.160.14(1)求年降水
(江苏卷27). ----Do you think their table tennis team will win the first place at the coming Asian Games? ----_________.Ours is much stronger than theirs. A. Of course B. It depend
-- Don’t you think hard work is what makes people succeed? -- ________________ A.I couldn’t agree more B.I hope so C.I’ve got it
----I haven’t seen Lily for a long time. What is she doing? ----- She is ______ in writing a novel. A.attracted B.included C.occupied
下列说法正确的是 A.L层上的电子数为奇数的原子一定是主族元素的原子 B.元素周期表共有18列,第8列属于第ⅧB族、第17列属于第VIIA族 C.元素周期表