[判断题]( )在防爆1区内，单相网络中的相线及中性线均应装设短路保护，并有双极开关同时切断相线和中性线。
A.正确
B.错误

[判断题]二次回路的操作电源分为直流与交流两大类。
A.正确
B.错误

[多项选择]驾驶货车在行驶过程中遇到前方隧道，车前有小轿车，应该（）
A. 提前减速，开启近光灯
B. 鸣喇叭提示，并注意小轿车动向
C. 加速越过小轿车驶入隧道
D. 紧急停车，等待小轿车驶入隧道

[单选题]依据《大庆油田有限责任公司危险废物环境保护管理规定》庆油发[2015]28号，油田公司（）组织对危险废物处置单位进行资质审查；对二级单位危险废物的产生、贮存、转移、处理过程进行监督；组织危险废物污染事故的调查与处理工作。
A.安全环保部
B.基建管理部
C.生产运行部
D.物资管理部

[单项选择]张某是某石油公司的业务员，一直代理公司与某农机站的石油供应业务。后张某被石油公司开除，但石油公司并未将此情况通知农机站，张某仍以石油公司的名义与农机站签订了合同，该合同属于( )。
A. 效力待定合同
B. 无效合同
C. 可撤销合同
D. 有效合同

[单选题]吸收比是在同一次试验中，60s时的绝缘电阻值与15s时的绝缘电阻值之比。
A.60min
B.90min
C.60s
D.90s
E.—

[单选题]Excel的( )以选项卡的形式列出Excel中的操作命令，默认情况下，包括“开始”、“插入”、“页面布局”、“公式”、“数据”、“审阅”、“视图”以及“加载项”选项卡等。
A.功能区
B.菜单栏
C.工具栏
D.绘图框

[填空题]The business memo (备忘录) is probably the most frequently used communication within a company. It is called an intra-company communication because it is used by people in their own company or organization. They change to letters, however, when they write messages to people who do not work for their company.
A memo creates a written record that may or may not be filed, depending on the receiver and the subject. As you know, spoken messages may be misunderstood or forgotten. A memo, however, becomes a record that does much to ensure the complete communication between the sender and the receiver.
The standard form of a memo frequently carries a pre-printed series of items: To, From, Date, and Subject. The first two items include the names of the receiver and the sender. A well-written subject line tells the reader the key topic or topics the memo is about.

Function: for communication within a