搜题请搜索小程序“爱下问搜题”
问题 填空题

从26个英文字母中任意选一个，是C或D的概率是______．

答案

英文字母共有26个，C、D共有2个，

根据概率公式，从26个英文字母中任意选一个，是C或D的概率是

2
26
=
1
13
．

选择题

选择与句中划线部分意义最接近的解释，并将其字母代号填入答题卷相应空格内。

小题1:Yang Shanzhou becomes well-known in China for planting so many trees for people.

A．great

B．famous

C．friendly

D．warm小题2:Try again, maybe you will come up with a better idea.              

A．turn up

B．put up

C．get up

D．think up小题3: It’s a chicken-and-egg question. I can’t answer you now.          

A. easy            13. clear         C. difficult          D. funny

小题4:Come and join us. We are short of hands.                             

A．We need help.

B．We hurt our hands.

C．Our hands are short.

D．We can do it by ourselves,小题5:--Dad, did you tell mother about our gift for her birthday?           

--No. Don’t let the cat out of the bag. Let’s give her a surprise

A．ask her

B．let her know

C．take away the eat

D．give her a eat
查看答案
选择题

如图2所示，是一种自动测定油箱内油面高度的装置，R是转动式变 阻器，它的金属滑片P是杠杆的一端，下列说法正确的是（    ）

A．油量表是由电流表改装而成的

B．R、R0在电路中是并联的

C．油位越高，流过R的电流越大

D．油位越高，R两端的电压越大
查看答案