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【单选题】
±5% 、 ±10% 、 ±20% 是常用电阻器的允许偏差,分别用字母 ( ) 来表示A.
K 、 J 、 M
B.
J 、 M 、 K
C.
J 、 N 、 M
D.
J 、 K 、 M
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【简答题】如图，正方形ABCD中，E是AD的中点，BM⊥CE，AB=6，则BM=______．
【单选题】关于电动锚控制线路的要求。下列说法正确的是_____。
A.
当主令控制器手柄从零位快速扳到高速档，电机也立即高速启动
B.
控制线路应适应电动机堵转1min的要求
C.
控制线路中不设过载保护
D.
控制线路中不需要设置零压保护环节
【单选题】What does the professor imply when she says this?
A.
The cooperative did not really reduce their annual fishing catch.
B.
The cooperative was making efforts to protect the fish.
C.
The cooperative is responsible for fewer fish in the river.
D.
The cooperative has to try to preserve the fish.
【单选题】What advice does the woman give to the man to reduce spendings?
A.
Check online to spend less on what he buys.
B.
Stop buying a new cell phone from now on.
C.
Stop buying the things he really needs or likes.
D.
Stop eating at the café and cook meals himself.
【单选题】What does the woman advise the woman to do to reduce anxiety?
A.
Smile and arrive on time.
B.
Have some sleep before the interview.
C.
Learn some does and don’t about the interview
D.
Practice questions and answers for the interview.
【多选题】关于电动机的试运行要求，下列说法正确的是（）。
A.
电动机试车通电前，应摇表测量绝缘电阻，其绝缘电阻值应大于2 MΩ
B.
电动机试车运行2h，如中途发现速度变化或声音不正常时，应立即断电找出原因
C.
多台电动机试车，不能同时启动，应先启动小功率电动机，后启动大功率电动机
D.
脱开与其相连的传动装置，使电动机处于空载状态，用手转动电动机机轴，机轴转动灵活，无卡阻或异响现象
E.
准备好试车记录表格，测量记录好试车时的环境温度等数据
【单选题】What advice does the woman give to the man to reduce spending?
A.
Check online to spend less on what he buys.
B.
Stop buying a new cell phone from now on.
C.
Stop buying the things he really needs or likes.
D.
Stop eating at the cafe and cook meals himself..
【多选题】关于电动机启动的要求,下列说法正确的是( )。
A.
电动机应有足够大的起动转距
B.
在保证一定大小的启动转距前题下,电动机的启动电流尽量小
C.
启动所需的控制设备,应尽量简单,价格低廉操作及维护方便
D.
启动过程中能量损耗应尽量小
【单选题】What advice does the woman give to the man to reduce spending?
A.
Check online to spend less on what he buys.
B.
Stop buying a new cell phone from now on.
C.
Stop eating at the cafe and cook meals himself.
D.
Stop buying the things he really needs or likes.
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