【单选题】【消耗次数：1】
两种远程超声的特点
①
操作简便
②
连接方便
③
图像清晰
④
可实时传输
⑤
以上均是
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相关题目
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异步传输模式（ ATM）实际上是两种交换技术的结合，这两种交换技术是
（ ）
①
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随机题目
【单选题】
9.“Has he seen this film?” “Yes. He _______ it several days ago.”
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saw
②
has seen
③
had seen
④
was seeing
【单选题】
2.She the door before she goes away.
①
had locked
②
is locking
③
has locked
④
was locking
【单选题】
10.Now Mike isn’t here. He _________ Mr. Green’s. Perhaps he _______ back in a few minutes.
①
went to; is coming
②
has gone to; will come
③
has been to ; will be
④
is going to; has come
【单选题】
8.They can’t leave until they ______ their work.
①
did
②
are doing
③
have done
④
has done
【单选题】
7. My uncle __________ to see me. He’ll be there soon.
①
comes
②
is coming
③
had come
④
came
【单选题】
14.They ______ lunch at home every day.
①
have not
②
didnt have
③
dont have
④
have not any