企业某新产品开发成功的概率为80%，成功后的投资报酬率为40%，开_爱下问搜题

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问题单项选择题

企业某新产品开发成功的概率为80%，成功后的投资报酬率为40%，开发失败的概率为20%，失败后的投资报酬率为-100%，则该产品开发方案的预期投资报酬率为（）。

A.18%

B.20%

C.12%

D.40%

答案

参考答案：C

单项选择题

关于tRNA的叙述哪一项是错误的（）

A.tRNA分子中含有稀有碱基

B.tRNA二级结构呈三叶草形

C.tRNA的二级结构有二氢尿嘧啶环

D.反密码环是有CCA三个碱基组成反密码子

E.tRNA分子中有一个额外环

补全对话，情景问答

从方框中选择合适的句子补全对话。

A. Is that for here or to go
B. And here's your change
C. May I help you
D. Do you want anything to drink with that
E. That comes to three dollars and thirty cents please

A: Welcome to Burger Town. 1_______?
B: Yes. I'd like a hamburger and an order of French fries .
A:  2_______.
B: Yes. I'll have a cup of coffee.
A: OK. That's a hamburger, an order of French fries , and a cup of coffee.  3_______?
B: For here.
A: 4_______.
B: Here you are.
A:  5_______  Your food will be ready in a moment.