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【多选题】

放炮崩倒棚子主要原因有( )。

A.

支架架设质量差

B.

放炮前没有检查或加固放炮地点附近的支架

C.

爆破参数选择不合理

D.

爆破后产生大块煤.岩抛向支架

题目标签：棚子

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【简答题】Nasreddin had a shed(棚子)behind his house. It had no lights in it. One night he went out to the shed to get his ladders(梯子)and lost his ring(戒指)there. He left the ladder, went out into the street and b...

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【单选题】Nasreddin had a shed(棚子)behind his house. It had no lights in it. One night he went out to the shed to get his ladders(梯子)and lost his ring(戒指)there. He left the ladder, went out into the street and b...

A.

ring

B.

silver

C.

money

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【单选题】错梁直线柱布置棚子的优点()

A.

机道上方顶板悬露窄

B.

支护及时

C.

支柱数量少工作量均衡

D.

易于组织管理

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【简答题】放炮崩倒棚子的原因是什么?

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【简答题】Nasreddin had a shed(棚子)behind his house. It had no lights in it. One night he went out to the shed to get his ladders(梯子)and lost his ring(戒指)there. He left the ladder, went out into the street and b...

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【简答题】Nasreddin had a shed(棚子)behind his house. It had no lights in it. One night he went out to the shed to get his ladders(梯子)and lost his ring(戒指)there. He left the ladder, went out into the street and b...

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【简答题】【名词解释】红军棚子

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【单选题】Nasreddin had a shed(棚子)behind his house. It had no lights in it. One night he went out to the shed to get his ladders(梯子)and lost his ring(戒指)there. He left the ladder, went out into the street and b...

A.

in his house

B.

in the street

C.

behind the house

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【简答题】Casablanca, Sep. 24 A flood swept across the coastal plain about 100 miles southwest of here, killing hundreds of Moroccans in a market place yesterday morning. Reports from the area said 218 bodies...

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【判断题】木棚子属于支撑式支护。( )

A.

正确

B.

错误

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