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【简答题】
中译文:与表面直接接触的流体由于导热而被加热,变轻,并且由于与相邻流体的密度差而上升。这种运动由于流体黏性而受到阻碍。
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举一反三
【单选题】听力原文：Which of the following statement is true according to the passage? (15)
A.
Tom missed his meeting.
B.
The taxi drivers in New York were on strike.
C.
There was an accident on his flight.
D.
He still attended the meeting owing to having met his friend by chance in Washington.
【单选题】I'm ________ in books these days since the finals are coming. [ ]
A.
caught
B.
buried
C.
stuck
D.
missed
【单选题】在数字签名技术中,发送方首先选择一个对称密钥并利用对称密钥加密技术对要发送的信息进行加密,然后再利用公用密钥加密技术并 ( )
A.
使用发送方自身的公钥对生成的对称密钥加密
B.
使用发送方自身的私钥对生成的对称密钥加密
C.
使用接收方的公钥对生成的对称密钥加密
D.
使用接收方的私钥对生成的对称密钥加密
【简答题】测得电路中A、B、C三点的电位:VA=2V,VB=5V,VC=0V,则:参考点是______________点,UAB=______________。
【单选题】在数字签名技术中,发送方首先选择一个对称密钥并利用对称密钥加密技
A.
要发送的信息进行加密，然后再利用公用密钥加密技术并（ ）
B.
使用发送方自身的公钥对生成的对称密钥加密
C.
使用发送方自身的私钥对生成的对称密钥加密
D.
使用接收方的公钥对生成的对称密钥加密
E.
使用接收方的私钥对生成的对称密钥加密
【单选题】The child was sorry______his mother when he arrived at the station.
A.
to miss
B.
having missed
C.
missing
D.
to havc missed
【单选题】Why does the man go to see his professor?
A.
To take a makeup test for a class that he missed
B.
To explain why he has been absent from class
C.
To turn in an extra credit project to the professor
D.
To ask the professor how to bring up his grade
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