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【单选题】
一台主机发送,一台主机接收,这是哪种通信方式的特征?A.
广播
B.
单播
C.
多播
D.
以上都不是
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举一反三
【单选题】John said that he ______ London twice.
A.
have been to
B.
have gone to
C.
had gone to
D.
had been to
【单选题】硬膜外麻醉下性行阑尾切除术,护士如何做到使病人体位稳定和舒适( )
A.
胸前放枕,支起上身
B.
抬高床头30~50cm,膝下15cm
C.
背部放枕支托,防侧倒
D.
足下放软枕,防下滑
E.
身前放小桌及枕,以求稳定舒适
【单选题】对正弦求三阶导数的表达式是:
A.
N[Sin[x], {x, 3}
B.
D[Sin[x], {x, 3}
C.
D[sin[x], {x, 3}
D.
N[sin[x], {x, 3}
【单选题】在救助头部受到撞击的伤者时，急救者要如何做，以下做法错误的是（）
A.
在伤者头部和双肩下塞进柔软的垫子
B.
把伤者的双肩和头部同时抬起
C.
单独把伤者头抬起
D.
如果伤者失去知觉，应把他的头轻轻转向一侧
【单选题】-He must have gone by bus. -No, he ____by bus
A.
mustn't go
B.
mustn't have gone
C.
can 't go
D.
can't have gone
【单选题】— Where's your father? — He ______ Shanghai. He'll be back next week. [ ]
A.
has gone to
B.
have gone to
C.
has been to
D.
have been to
【单选题】He is not in the office. He must have gone to have classes, ______ ?
A.
didn't he
B.
doesn't he
C.
mustn't he
D.
hasn't he
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