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【单选题】
标定 NaOH 滴定液常用的基准物质是A.
硼砂
B.
邻苯二甲酸氢钾
C.
碳酸钙
D.
无水碳酸钠
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举一反三
【单选题】Choose the best answer accoding to the recording. The Chinese don’t give clocks as presents because they think the clocks may have an implied meaning of ___________.
A.
taboo
B.
funeral
C.
even
D.
connotation
【单选题】The history of clocks is very long, and there have been many different types of clocks over the centuries. 1. __________________________________
A.
Dividing the day into hours, minutes,and seconds
B.
Using the sun
C.
Dividing the year into months and days
D.
Sundial clocks
E.
Water clocks
F.
Pendulum clocks
【单选题】----Your T-shirt looks nice. Is it ______wool? ----Yes, and it’s a ______Inner Mongolia.
A.
made of, made by
B.
made of, made in
C.
made by, made for
D.
made by, made from
【简答题】A．Bells and masks. B．Clocks and masks. C．Clocks and swords. D．Bells and swords.
【简答题】从4名男生和2名女生中任选3人值日，设随机变量ξ表示所选3人中女生的人数． （Ⅰ）求ξ的分布列、数学期望Eξ； （Ⅱ）求事件“所选3人中女生至少有1人”的概率．
【单选题】What is the meaning of 'working round the clock'?
A.
Repairing clocks.
B.
Making clocks.
C.
Working with a clock nearby.
D.
Working day and night.
【简答题】从5名女生和2名男生中任选3人参加英语演讲比赛，设随机变量ξ表示所选3人中男生的人数． （1）求ξ的分布列； （2）求ξ的数学期望； （3）求“所选3人中男生人数ξ≤1”的概率．
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