【多选题】
岩巷快速施工新技术中，可实现平行交叉作业的工序有（）。
①
砌水沟与铺永久轨道平行作业
②
装药与出矸石平行作业
③
工作面打锚杆与装岩平行作业
④
钻眼、装岩与永久支护平行作业
⑤
移动耙斗式装岩机与延接风水管路平行作业
【单选题】
当直线、平面与投影面平行时，该投影面上的投影具有( )
①
Normal
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7.8 磅
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false
false
false
EN-US
ZH-CN
X-NONE
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积聚性
②
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真实性
③
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类似收缩性
④
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收缩性