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【单选题】
如图所示是冶炼金属的高频感应炉的示意图 . 高频感应炉中装有待冶炼的金属,当线圈中通有电流时,通过产生涡流来熔化金属 . 以下关于高频感应炉的说法正确的是( ) A .高频感应炉的线圈中必须通有变化的电流,产生涡流 B .高频感应炉的线圈中通有恒定的电流,也可以产生涡流 C .高频感应炉是利用线圈中的电流产生的焦耳热使金属熔化的 D .高频感应炉是利用炉内金属中的涡流的热效应使金属熔化的A.
B.
C.
D.
D
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【简答题】阅读理解。 In 1977, Jack, an Italian-American who lived in San Francisco, flew from America to Italy to visit his relatives. On the way, the plane made a one-hour stop to refuel (加油) at the New York Airpor...
【简答题】Picture the scene: the battery on your mobile phone has run out． You can't make any calls for help and no one can contact you． You are all alone - well, not quite． Just reach into your pocket and take...
【简答题】Can you make calls and access to the internet in the hotel room?
【简答题】听下面一段材料，回答第1-3题。 1. Why does the woman look rather pale? A. Because she caught a bad cold. B. Because she was sick last night. C. Because she didn't sleep last night. 2. When did Jack eat at that new ...
【简答题】询问对方在哪里工作,怎么说:“请问您在哪里.....”。
【单选题】Jack was a lazy boy. He was often caught ______ in class.
A.
sleeping
B.
slept
C.
to sleep
D.
sleep
【简答题】In which countries can you make collect calls? In___________.
【单选题】The man is making the call because the cell phone
A.
can't receive or make calls.
B.
can receive signals but always cuts off halfway.
C.
can make calls but the signal is not clear.
D.
can only receive incoming calls.
【单选题】The car ________ on the way , consequently ________ .
A.
was stuck in the mud ; which led to Jack to miss the train
B.
was caught in the mud ; and led Jack’s missing the train
C.
was held up in the traffic ; leading to Jack’s missing the train
D.
was held back in the traffic ; it led to Jack’s missing the train
【单选题】Jack was caught in a car accident, _____ he was late for the meeting.
A.
so as
B.
so that
C.
in order that
D.
in order
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