问题
单项选择题
起重机械的变幅机构是依靠（）的方式使吊具移动而改变幅度的机构。
A.臂架俯仰或小车运行
B.臂架俯仰和小车运行
C.臂架俯仰或大车运行
D.以上都不对
答案
参考答案：A
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起重机械的变幅机构是依靠（）的方式使吊具移动而改变幅度的机构。
A.臂架俯仰或小车运行
B.臂架俯仰和小车运行
C.臂架俯仰或大车运行
D.以上都不对
参考答案：A
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| The telephone rang in the police station at Richmond, California, USA. "Police station? A train for Santa Fe collide (相撞) with a 1 at the McDonald Street Crossing. Please go there at once, with an ambulance, too. A man is badly wounded." said 2 voice of a young woman. "Just a minute. We'll come 3 . Please stay there and wait." Answered the policeman. Within a minute, a police car and an ambulance (救护车) 4 . Soon they got to the 5 , but only to find 6 was fine. No collision, 7 wounded man." 8 a dirty trick!" said the policeman angrily. "We must find out that mischievous (恶作剧的) 9 and …" They had not been able to say anything about a 10 when they heard the whistle of a train: the train was nearing them quickly. All 11 a sudden, a truck appeared. It suddenly 12 to move on. Right then and there, before the eyes of all the people 13 , the train collide with the truck heavily and 14 it dozens of meters away. When Randolph Bruce, the driver, was 15 out of the damaged truck, he was 16 wounded just as the young woman had foretold on the 17 . As he was taken to the 18 in time, he was saved at last. Later the policeman did whatever they could to find the woman who had telephoned them but 19 . It is surprising that a prophecy (预言) should coincide with the 20 so exactly. | ||||
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