【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.
【判断题】机油泵输出的油量与发动机转速成正比。()
【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】测得电路中
B.
C三点的电位:V A =2V,V B =5V,V C =0V,则:参考点是______点,U AB =______。
【单选题】下列有关下西洋的描述中,不正确的是()。
【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( )
【单选题】The child was sorry______his mother when he arrived at the station.