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【单选题】
减数分裂中期I时,每条染色体的两条姐妹染色体可能有质的不同,因前期I时,发生( )交换。A.
同源染色体的非姐妹染色单体片段
B.
同源染色体的姐妹染色单体片段
C.
非同源染色体之间的染色单体片段
D.
遗传背景不同的染色单体片段
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】电池箱内有四个蓄电池,正极与正极相连,负极与负极相连。蓄电池的开路电压和内阻分别为12.2V和0.5欧姆,12.1V和0.1欧姆,12.4V和0.16欧姆,12V和0.2欧姆。则电池箱的戴维宁等效电源电动势为_____,戴维宁等效电阻为______。
A.
12.3V,0.043欧姆
B.
13.2V,0.034欧姆
【单选题】Passage 2--- Question 55. What does the author suggest businesses and the government do?--- (Para. 1) Imagine you enter a car with no steering wheel, no brake or accelerator pedals (踏板).Under a voice-...
A.
Keep pace with technological developments.
B.
Make new technologies affordable to everyone.
C.
Enable everyone to benefit from new technologies.
D.
Popularize the use of new technologies and devices.
【简答题】1 Lunch break at the hotdog stand in the park is the most e__________ and interesting time of day for me.
【多选题】在带领旅游者到大型娱乐场所游玩时,地陪应做好的工作有( )。
A.
提醒旅游者不要走散
B.
随时注意旅游者的动向
C.
随时观察周围的环境
D.
了解不同娱乐的特点
E.
了解该旅游场所出口的位置
【简答题】何谓施工现场的“三宝”与“四口”？
【单选题】Passage 2--- Question 52. How would the elderly and the disabled benefit from driverless cars?--- (Para. 1) Imagine you enter a car with no steering wheel, no brake or accelerator pedals (踏板).Under a ...
A.
They could enjoy greater mobility.
B.
They would have no trouble driving.
C.
They would suffer no road accidents.
D.
They could go anywhere they want.
【简答题】影响金属可锻性的因素有哪些？
【简答题】三宝四口五临边是什么?
【单选题】u =- 100 cos ( 6 π t + 10 ° ) V 超前 i = 5cos ( 6 π t - 15 ° ) A 的相位差是
A.
95°
B.
115°
C.
25°
D.
-25°
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