【简答题】It was midday when I got the call that my grandfather was not well and he was quickly getting worse. My family did not know how long he would in the world. I knew I had to get to the hospital to tell ...
【判断题】任何一项审计活动中,审计三方面关系人都存在。
【判断题】电控柴油机可以实现减速断油功能,化油器发动机不能实现。()
【简答题】It was midday when I got the call that my grandfather was not well and he was quickly getting worse. My family did not know how long he would stay in the world. I knew I had to get to the hospital to ...
【单选题】水稻的高杆和矮秆由一对等位基因控制( B、b),抗病与易感病由另一对等位基因控制(T、t),均为完全显性,现有纯合高杆抗病和纯合矮秆易感病的两种亲本杂交,所得F 1 均为高秆抗病, F 1 自交,多次重复实验,统计 F 2 的表现型及比例,都近似得到如下结果:高秆抗病:高秆易感病:矮秆抗病:矮秆易感病 =66:9:9:16.由实验结果可知,下列说法错误的是
A.
等位基因 B、b与T、t的遗传都符合基因的分离定律
B.
控制这两对相对性状的两对等位基因的遗传不符合基因的自由组合定律
C.
出现性状重组类型的根本原因是在减数第一次分裂时发生了基因重组
D.
对 F 1 测交,测交后代会有四种表现型,比例应接近 1:1:1:1
【单选题】He'll call you when he____there. [ ]
【单选题】I didn’t know when he _____ back. He said he would call me when he _____ home.
【判断题】电控柴油机可以实现减速断油功能,化油器发动机不能实现。
【单选题】下列有关实验的叙述,错误的是
A.
以过氧化氢为底物,设置肝脏研磨液和清水的对照实验,可验证酶的高效性
B.
运用纸层析法分离菠菜叶片色素,实验结果可反映光合色素种类和相对含量
C.
统计洋葱根尖各分裂时期的细胞数目,可推算各时期在细胞周期中所占比例
D.
通过定期检测培养瓶中的酵母菌种群数量,可建立种群数量增长的数学模型
【单选题】He hasn't got any hobbies—_______ you call watching TV a hobby. [ ]