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【单选题】
当发生重大事故时，事故调查组应当按照国家有关规定开展事故调查，并在（）日调查期限内向组织事故调查组的机关或者铁路管理机构提交事故调查报告。A.
60
B.
30
C.
20
D.
10
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】The length of time that elapses between the day a firm purchases an inventory item and the day that item sells is called the
A.
operating cycle
B.
inventory period
C.
accounts receivable period
D.
accounts payable period
【单选题】导轨加工多段对接的较长床身,如6M龙门刨的床身是由3 段对接的,若没有设备来加工全长,只有分段加工,这就要保证三段床身导轨的几何形状,空间位置完全相对应。一般采取( )为基准的方法。
A.
做模具
B.
精密计算
C.
仿形加工
D.
做样板
【单选题】导轨加工多段对接的较长床身，如6M龙门刨的床身是由3 段对接的，若没有设备来加工全长，只有分段加工，这就要保证3段床身导轨的几何形状，空间位置完全相对应。一般采取( )为基准的方法。
A.
做模具
B.
精密计算
C.
仿形加工
D.
做样板
【单选题】— I passed my driving test at the first _____. — Congratulations! [ ]
A.
purpose
B.
desire
C.
attempt
D.
wish
【简答题】阅读理解 Children in the USA like K Day very much. K is for kites. March 7 is the day. On that day lots of children go out in the open air. They take their kites with them. One kite is very big. Others ar...
【简答题】阅读理解。 Children in the USA like K Day very much. K is for kites. March 7 is the day. On that day lots of children go out in the open air. They take their kites with them. Some kites are very big . Othe...
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