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【单选题】
假定在杂种 CcSHsh 的 100 个孢母细胞内,有 7 个交换发生在基因之内, 93 个交换 发生在基因之外,计算得重组率为:A.
3.5%
B.
7.0%
C.
1.8%
D.
14.0%
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反馈参考答案：
举一反三
【判断题】比较优势理论是最早研究国际直接投资的理论，它由美国经济学家海默在1960年首先提出，后来约翰、凯夫斯和金德尔伯格等人又对其做了进一步补充，其目的是解释企业的国际直接投资行为。
A.
正确
B.
错误
【多选题】自动分拣系统类型很多,但其主要组成部分基本相仿,大体上由进货输入输送机、()、分拣传送装置及分拣机构、分拣卸货道口、计算机控制系统等七部分组成。
A.
送喂料输送机
B.
合流输送机
C.
分流输送装置
D.
分拣指令设定装置
【单选题】Which statement can most safely be made about the platoon commander?
A.
He observed army customs to the letter.
B.
He gave command of the troops to Broadhurst.
C.
He refused to give the narrator any instructions.
D.
He expected his subordinates to execute orders on their own.
【单选题】Which statement is true according to the passage?
A.
Bulls will have some loss when stock market goes up.
B.
Bears will get some profits when stock market goes up.
C.
Bears may replace the stocks that they borrow until the stock market goes up.
D.
Bears may wait to replace stocks that they borrow until they get profits.
【单选题】In Unit 5. Which statement is true about the earth's movement?
A.
The earth spins and travels around the sun at the same time.
B.
One day is the time it takes the earth to travel around the sun once.
C.
One year is the time it takes the earth to spin around once.
D.
It is impossible to measure the earth's movement.
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