简述VMI与 [单选题](____)及电容器接地前应逐相充分放电。
A.避雷器 B.电缆 C.导线 D.变压器 [判断题]严禁钻车底通过,严禁跨跃检修地沟,行走或站立(接送车)必须在车辆限界以外。
A.正确 B.错误 [判断题]
NaNO3和(NH4)2SO4都是生理碱性盐。 [单项选择]
Scientists say they now have proof to support the old-fashioned advice that it’s best to sleep on a problem. They say sleep strengthens the memory and helps the brain organize the masses of information we receive each day. Lead researcher Bob Stickgold at the Harvard Medical School said, "Sleep helps us draw rules from our experiences. It’s like knowing the difference between dogs and cats. even if it’s hard to explain. " The US research team studied how well students remembered connections between words and symbols (象征) , reports New Scientist. They compared how the students performed if they had had a sleep between seeing the words and having the test, and if they had not slept. They found that people were better able to remember lists of related words after a night’ s sleep than after the same time spent awake during the day. They also found it easier to remember themes (主题) that the words had in common. But they forgot around one in four more [单选题]雷达机房应使用金属板门和金属门框,金属板门应通过2条不小于( )mm2软金属线与门框连接。
A.6 B.10 C.16 D.25 [单选题]在生产经营决策分析中,属于决策非相关成本的是()。
A.边际成本 B.机会成本 C.专属成本 D.共同成本 [单项选择]关于空气源热泵机组说法错误的是()。
A. 以空气为低位热源的空气/水热泵机组称为空气源热泵机组 B. 机组安装前应开箱检查,首先需要检查机组的外观是否存在明显损伤,同时检查管道是否有裂痕,压力表是否指示正常,用以判断机组是否产生制冷剂泄漏。 C. 空气源热泵冷水机组的水侧应充注满水,并放尽管内空气,用手动柱塞泵,对管内加压至0.8MPA,仔细检查是否渗漏,在确信无渗漏之后,即可保温水管。 D. 机组设备安装的水平度的允许偏差为0.02%。 [填空题]无缝线路发生胀轨跑道时,应对胀轨跑道情况按规定内容 。
[判断题]( )GSM-R记录模块(TM6431)负责记录两系中适配器模块与TM6440模块、适配器模块与RIME模块之间的通信数据; 通信数据被保存在CF卡中, 可通过配套的GSM-R分析软件进行数据分析。
A.正确 B.错误 [单选题]麻疹的主要传播方式
A.密切接触传播 B.消化道传播 C.飞沫传播 D.虫媒传播 E.血液传播 [判断题]超硬磨具选用粗粒度也能获得低的表面粗糙度。( )
[简答题]工程地质勘查的目的是什么?
[多选题]电子银行承兑汇票是指( )依托电子商业汇票系统,以( )形式制作的,委托辖内法人机构在指定日期无条件支付确定金额给收款人或持票人的票据。
A.出票人 B.收款人 C.电文 D.数据电文 我来回答: 提交
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