巷道施工开拓新水平的井巷第一次接近未揭露的煤层时，按照地测部

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问题单项选择题

巷道施工开拓新水平的井巷第一次接近未揭露的煤层时，按照地测部门提供的掘进工作面距煤层的准确位置，必须在距煤层（）以外开始打钻。

A.5m

B.8m

C.10m

D.15m

答案

参考答案：C

阅读理解

阅读短文，判断正( T)误 ( F)。

A Shopping Trip

One morning Mr and Mrs Green go shopping in their car. In the shop they sec a lot of clothes.

Mrs Green likes them. So she buys a shirt for their son, a skirt for their daughter, and a sweater

for Mr Green. She buys a blouse for herself, too.

At about twelve o'clock, they go home, but they lose their way. Mr Green drives over to an old

man and asks, "Where am I?" " You're in your car, sir. " he answers.

( )1. Mr and Mrs Green go shopping in the afternoon.

( )2. Mrs Green buys a sweater for herself.

( )3. At eleven o'clock, they lose their way.

( )4. The old man is humorous (幽默的) .

单项选择题

下列心电图表现提示心房颤动的是（）。

A.P波被f波取代，房率350～600次/分

B.P波被f波取代，房率250～350次/分

C.P波高尖，电压超过0.25mV

D.P波增宽，时间超过0.12s

E.P-R间期延长，时间超过0.12s