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【多选题】
在不稳定的表土层和松软破碎的岩层中进行井筒和巷道的施工，通常采用特殊施工方法，下列属于该特殊方法的是（）。A.
冻结法
B.
爆破法
C.
沉井法
D.
注浆法
E.
帷幕法
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参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】如何理解商誉,有哪些特点?
【单选题】为保证饮用水质的卫生安全，井水必须经常消毒。现有井水70m3，氯化消毒剂的有效氯含量为60％，需氯量为4g／m3，要保证饮用水的卫生安全至少需加入氯化消毒剂
A.
460g
B.
467g
C.
473g
D.
488g
E.
502g
【简答题】常用 饮水 氯化消毒剂 有哪些?简述 影响饮水氯化消毒效果的因素 。
【单选题】What does the passage mainly tell us?
A.
The values are different between the old and the young.
B.
The moral problems raised by old people.
C.
The personal freedom for the old.
D.
Old people' s viewpoint on life.
【单选题】'The twilight of their years' (Line 5, Para. 5) refer to______.
A.
their old years
B.
their young years
C.
their good years
D.
their bad years
【单选题】The old lady watched her grandson ____ a yo-yo yesterday afternoon.
A.
to play with
B.
to play
C.
playing with
D.
plays
【单选题】氯化消毒是我国目前饮用水消毒最常用的方式,供饮用水消毒的氯制剂主要有液氯、漂白粉、漂白粉精和有机氯制剂等,氯化消毒过程中起主要作用的物质是
A.
Cl 2
B.
HOCl
C.
OCl -
D.
Cl -
E.
NH 2 Cl
【单选题】The passage indicates that Alzheimer's is a disease ______.
A.
common to people, old and young
B.
not costly to be cured
C.
easy to be handled
D.
not easy to be diagnosed
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