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问题 单项选择题

在有煤尘或瓦斯的环境中掘进巷道，装药起爆前和爆破后，必须检查爆破地点（）范围内风流中的瓦斯浓度。

A.10m

B.20m

C.30m

D.40m

答案

参考答案：B

填空题

旅游服务的缺陷，突如其来的变故，以及游客潜意识中的不安全感，都会使游客心理受挫，情绪震荡，使其言行相应表现出（）状态，打破旅游团原有的平静，导致团队出现（）。
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单项选择题

Which of the following statements is true according to what you hear

Which of the following statements is true according to what you hear
A．The growth rate in 2003 is lower than that of the previous year.
B．This year the government will continue to support lending and investment in construction~
C．The government will cut state bonds by 35% in 2004.
D．State bonds issued to finance construction will be $3.6 billion less this year than last.

A．The growth rate in 2003 is lower than that of the previous year.

B．This year the government will continue to support lending and investment in construction~

C．The government will cut state bonds by 35% in 2004.

D．State bonds issued to finance construction will be $3.6 billion less this year than last.
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