Error may be introduced into a magnetic compass by().
A. making a structural change to the vessel
B. a short circuit near the compass
C. belt buckles
D. All of the above
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哪一项不是pre-launch LTE drive test?()
A. Each session started from EMM-DEREGISTERED state
B. Each session started from RRC-IDLE EMM-REGISTERED state
C. Each session started from RRC-CONNECTED state
D. Each session started from pdp-connect-request
临时用工、外来施工人员必须进行公司级安全教育,进入单元生产区域工作的人员还需进行单元级安全教育。其中单元级安全教育时间不应少于()
A. 4h
B. 6h
C. 8h
D. 12h
属于磨擦力防松装置的是()。
A. 开口销防松
B. 止动垫圈防松
C. 串联钢丝防松
D. 弹簧垫圈防松
城市轨道交通车站可分为()、站厅、候车厅、()和综合开发区等主要功能区。