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【简答题】
半导体硅元素在化学元素周期表中序号是 ,硅原子最外层排列 个电子,硅原子之间以 键 结合,因此具有较高的 和 ,化学性质也比较稳定。
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举一反三
【单选题】You are on watch at sea a man falls overboard on the port side, forward near No. 1 hatch. What of the following should you do first?（）.
A.
Call the master
B.
Put the helm hard over toward the port side
C.
Sound the alarm to arouse all hands
D.
Stop the engines
【单选题】John rode to the park just now, but now he _____. Can’t you see him in his bedroom?
A.
comes back
B.
has come back
C.
is coming back
D.
came back
【单选题】—Do you see John? —No, but just now, he still __ the room. [ ]
A.
is in
B.
was in
C.
into
D.
was into
【简答题】设随机变量 的分布函数为 则 的分布律为____ 注意:(如果答案是整数,就填整数,如果答案是分数,能除完就写除完的答案,例如 ,答案就填1.25,除不完就精确到小数点后两位,保留三位小数, 例如 ,答案填6.667,各查表值写成小数的形式,保留到小数点后的三位)
【单选题】— Why don’t we go to see a film now?— ().
A.
What are you talking about?
B.
I am tied up.
C.
What a delightful idea
D.
I don’t want to go with you.
【单选题】设随机变量 的分布函数为 则 的分布律为( )
A.
Y -1 2 4 P 0.2 0.7 0.1
B.
Y -1 2 4 P 0.2 0.5 0.3
C.
Y 1 4 6 P 0.2 0.4 0.4
D.
Y 1 4 6 P 0.2 0.5 0.3
【单选题】—Sorry, Jim isn't in right now. —Can you tell him to ring me up if you ______ him? [ ]
A.
see
B.
will see
C.
saw
D.
are seeing
【单选题】晏几道《阮郎归·旧香残粉似当初》中词人之所以“梦魂纵有也成虚,那堪和梦无”的原因是 ______ 。
A.
仕途不顺
B.
没办法忘记负心无情的恋人
C.
十分思念家乡和家人
D.
有许多抑郁不平的事积在心头
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