题目内容

天然气集输管线放空时，易发生操作事故，下列操作方法，正确的是()。

A. 先点火后放空，在放空管口火焰高度降到1m以下时，立即关闭放空阀，以避免负压吸入空气
B. 先放空后点火，在放空管口火焰高度降到1m以下时，立即关闭放空嘲，以避免负压吸入空气
C. 先点火后放空，在放气管口火焰高度10m时，立即关闭放空阀，以避免负压吸入空气
D. 先放空后点火，在放空管口火焰高度10m时，立即关闭放空阀，以避免负压吸入空气

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Section B
Directions: This section is to test your ability to understand short conversations. There are 2 recorded conversations in it. After each conversation, there are some recorded questions. The conversations and the questions will be spoken only once. When you hear a question, you should choose the correct answer from the 4 choices marked A, B, C, and D.
听力原文：W: Hey! The train is late! I've been waiting her for ages.
M: Which train, madam？
W: The 8:18 to Baker Street.
M: The 8:187 I'm afraid you've made a mistake, madam.
W: A mistake.'？ My timetable says: Baker Street train—8:18.
M: Oh, no, madam. The Baker Street train leaves at 8: 08.
W: At 8:08？
M: You see, madam. They changed the timetable at the end of April.
W: Changed it？ May I see the new timetable'？ What does it say？
M: It says: Baker Street train—8:08.
W: Hm! So the train isn't late. I'm late.
Q9. Why did the woman miss the train？
(11)

A. Because the train was late.
Because the train was canceled.
C. Because she didn't know the timetable was changed.
D. Because she was late.

矿山安全技术
本部分共10小题，每小题1分。每题的备选项中只有一个最符合题意。
冲击地压的防治措施分为防范措施和解危措施两大类。下列措施，可作为解危措施是()。

A. 卸载爆破
B. 确定合理开采程序
C. 加强顶板控制
D. 大断面掘进

特雷诺指数用的是全部风险。()

A. 正确
B. 错误

企业投资者、个人投资者购买基金份额均免征印花税。()

A. 正确
B. 错误