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【简答题】
在三棱锥S-ABC中，∠SAB=∠SAC=∠ACB=90°，AC=1，BC= ，SB=2 ， （1）求三棱锥S-ABC的体积； （2）求二面角C-SA-B的大小； （3）求异面直线SB和AC所的余弦值。
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举一反三
【简答题】A．With the reader himself in the story. B．Telling stories about the reader himself. C．Printed with standard things. D．Published with the help of computer.
【单选题】A good story does not necessarily have a happy ending, but the reader must not be left _______. [ ]
A.
unsatisfied
B.
unsatisfying
C.
to be unsatisfying
D.
being satisfied
【单选题】In a traditional novel, the plot usually reveals the entire story and gives the reader a sense of______ when he finishes reading.
A.
completion
B.
satisfaction
C.
responsibility
D.
humor
【单选题】A good story does not necessarily have to have a happy ending, but the reader must not be left __________________.
A.
unsatisfying
B.
unsatisfied
C.
to be unsatisfying
D.
being unsatisfied
【简答题】报关员注册有效期届满后连续2年仍未申请报关员注册，将予以撤销报关员注册资格，报关员资格证也随之失效。（ ）
【简答题】报关员注册有效期为3年。
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