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【单选题】
风蚀作用包括吹蚀和磨蚀两种方式。其中吹蚀作用的主要对象是( )。
A.
干燥的粉砂级和粘土级碎屑
B.
砾石层
C.
粗砂层
D.
软弱基岩面
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【简答题】There were smiling children all the way. Clearly they knew at what time the train passed their homes and they made it their business to stand along the railway, wave to complete strangers and cheer th...
【简答题】There were smiling children all the way. Clearly they knew at what time the train passed their homes and they made it their business to stand along the railway, wave to complete strangers and cheer th...
【多选题】塔式起重机的工作机构主要有( )等机构。
A.
起升机构
B.
回转机构
C.
变幅机构
D.
运行机构
【简答题】There were smiling children all the way. Charily they knew at what time the train passed their homes and they made it their business to stand along the railway, wave to complete strangers and cheer th...
【简答题】There were smiling children all the way. Clearly they knew at what time the train passed their homes and they made it their business to stand along the railway, were to complete strangers and cheer th...
【简答题】固定自升式塔式起重机的工作机构有 、 、 、 。
【单选题】放松时左手应是怎样的状态?
A.
方形
B.
圆弧形
C.
蜷缩在一起
D.
手指全部伸直
【单选题】塔式起重机的工作机构有起升机构、回转机构、()、运行机构。
A.
制动机构
B.
变幅机构
C.
变速机构
D.
起重机安全作业
【多选题】塔式起重机的工作机构有()。
A.
起升机构
B.
变幅机构
C.
回转机构
D.
行走机构
E.
顶升机构
【多选题】塔式起重机的工作机构主要有 等机构( )。
A.
起升
B.
回转
C.
变幅
D.
运行
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