For each blank, choose the best answer from the four choices and write down on the answer sheet.
(21) is a six bytes OSI layer 2 address which is burned into every networking
device that provides its unique identity for point to point communication.
(22) is a professional organization of individuals in multiple professions which focuses on effort on lower-layer protocols.
(23) functions with two layers of protocols. It can connect networks of different speeds and can be adapted to an environment as it expands.
(24) is the popular LAN developed under the direction of the IEEE802.5.
(25) is the popular backbone technology for transmitting information at high speed with a high level of fault tolerance which is developed under the direction of ANSI.
| Guthrie’s contiguity principle offers
practical suggestions for how to break habits. One application of the threshold method involves the time young children spend on academic activities. Young children have short attention spans, so the length of time they can sustain work on one activity is limited. Most activities are scheduled to last no longer than 30 to 40 minutes. However, at the start of the school year, attention spans quickly wane and behavior problems often result. To apply Guthrie’s theory, a teacher might, at the start of the year, limit activities to 15 to 20 minutes. Over the next few weeks the teacher could gradually increase the time students spend working on a single activity. The threshold method also can be applied to teaching printing and handwriting. When children first learn to form letters, their movements A. Parents introduce spinach in small bites or mixed with a food that the child enjoys over time so that the child will not refuse to eat it. B. Teachers introduce academic content in short blocks of time for young children and gradually increase session length but not to where students become frustrated or bored. C. Paper with wider lines is first used and then paper with narrow lines is introduced step by step to help children learn printing and handwriting. D. A child might be made to throw toys until it is no longer fun by his parents in order to change his behavior of repeatedly throwing toys. [多选题]紧线过程中关于人员应遵守的规定，下列说法正确的是（）。
A.可以站在悬空导线、地线的垂直下方 B.不得站在悬空导线、地线的垂直下方 C.不得跨越将离地面的导线或地线 D.不得站在线圈内或线弯的外角侧 E.不得站在线圈内或线弯的内角侧 [单选题]针对大众的传播媒介不包括（）。
A.电视 B.报纸 C.杂志 D.讲课 E.广播 [填空题]浸膏剂每一克相当于（）克原材料。
[判断题]桥梁结构物的预应力属于其它外力。
[单选题]按照NB/T33001—2018《电动汽车非车载传导式充电机技术条件》中的规定,充电机应具有与()通信的功能,获得电动汽车蓄电池系统充电参数和充电实时数据。
A.电动汽车蓄电池管理系统 B.电网 C.车载终端 D.运营管理系统 [单选题]机车互换配件台账的保存期限为（）。
A.永久 B.10年 C.5年 D.3年 [单项选择]碾压混凝土坝的施工工艺程序正确的是( )。
A. 初浇层铺砂浆—平仓机平仓—汽车运输入仓—振动压实机压实—振动切缝机切缝 B. 初浇层铺砂浆—汽车运输入仓—平仓机平仓—振动压实机压实—振动切缝机切缝 C. 初浇层铺砂浆—汽车运输入仓—平仓机平仓—振动切缝机切缝—振动压实机压实 D. 初浇层铺砂浆—汽车运输入仓—振动压实机压实—平仓机平仓—振动切缝机切缝 [判断题]煤矿运来的煤输入煤斗后，便和经过预热的空气一起进入锅炉内燃烧。
A.正确 B.错误 [判断题]故意杀人罪属于侵犯公民人身权利的犯罪。
A.正确 B.错误 [简答题]回旋钻孔施工中埋钻的处理方法有哪些？
[单项选择]急性粒细胞白血病M2a型的特征性改变
A. 白血病细胞α-丁酸萘酚酯酶染色阳性 B. 白血病细胞形态变异，核质发育不平衡 C. PML/RARa融合基因 D. 白血病细胞5′-核苷酸酶染色阳性 E. CBFP-MYHll融合基因 [填空题]井下放炮，爆破工接到起爆命令后，必须先发出（），至少再等（）时间，方可放炮。
[单选题]抵押权人应当在主债权诉讼时效期间行使抵押权；未行使的，人民法院____。
A.根据抵押权人及抵押人协商按比例保护 B.依然保护 C.部分保护 D.不予保护 [判断题] 磁力线是磁场中实际存在的一种曲线,从N 极出发到S极终止。
A.正确 B.错误 [单选题] 外部过电压的大小一般与( )有关。
A.系统额定电压 B.被击物阻抗; C.系统额定电流 D.系统最高运行相电压的倍数 [单选题]在光纤通信中，数字码流由（ ）构成。
A.十进制 B.B.二进制 C.八进制 D.十六进制 [多选题]电缆线路可以( )敷设。
A.沿地面 B.埋地 C.沿围墙 D.沿电杆或支架 E.沿脚手架 [填空题]硒化法主要用于（）的制造。
[单项选择]Some ______ good luck brought us nothing but trouble.
A. seemingly B. satisfactorily C. uniformly D. universally [单选题]1-螺纹隔爆结构：螺纹精度不低于()级；螺距不小于()㎜；
A.3;0.7 B.1;0.7 C.2;0.8 我来回答: 提交
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