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【简答题】
Off to a Bad Start David Hu had just started working for the foreign owned company. He was sitting at his work station but had not been given any assignment that he should be doing at this moment. He was relaxing and waiting and then thought he would take the opportunity to have a look around. He poked his head into several offices just to see what there was to be seen. Suddenly Mr. Parker came up to him and angrily asked him what he was doing. David Hu was embarrassed. He laughed and quickly started to move back toward his workstation. This did not seem to satisfy Mr. Parker who started to talk rapidly and angrily. Hoping to calm him down, Mr. Hu smiled and apologized, trying to explain that he was trying to learn more about the department. However, Mr. Parker got even angrier. Finally, another worker came by and calmed him down, but Mr. Parker left, he still looked angry. Mr.Hu sighed; he knew he had made a bad start but still didn’t understand why.
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【单选题】汽车尾气(含有烃类、CO、NO x 、SO 2 等)是城市空气的主要污染源,治理方法之一是在汽车排气管上加装 “催化转化器”,它能使CO和NO x 反应生成可参与大气循环的无毒气体,并使烃类充分燃烧、SO 2 充分转化。下列说法中错误的是 [     ]
A.
CO和NO x 反应的化学方程式为2xCO+2NO x =2xCO 2 +N 2
B.
上述方法的缺点是导致空气中CO 2 含量增大
C.
植树造林、增大绿化面积,可有效减少城市空气污染的程度
D.
汽车改用天然气或氢气为燃料,都会减少对空气的污染
【判断题】电阻器上的色环颜色若有金色,代表误差为20%。
A.
正确
B.
错误
【多选题】电阻器的色环颜色有:A、黄 B、紫 C、蓝 D、橙。
A.
B.
C.
D.
【单选题】----Let's have a cup of coffee. ----_____________________
A.
My pleasure.
B.
It sounds good.
【判断题】电阻器上的色环颜色共有13种。
A.
正确
B.
错误
【简答题】题如图所示RLC并联正弦交流电路中,已知R=X L =X C ,且I=4A,求i 1 、i 2 的有效值。
【单选题】Let’s have a cup of coffee, ____?
A.
shall we
B.
will you
C.
do you
【简答题】已知电路如图a所示,R 1 =5Ω,R 2 =3Ω,X L =2Ω,X C =3Ω,电压表读数为6V,试求电流表读数,并画出相量图。
【简答题】汽车尾气中主要含有烃类 . _______________ 和 NOx 等有害物质 , 前两种是燃料不完全燃烧的产物 , 后者则是由气缸中的高温条件所造成的 .
【简答题】和平公司采用完全成本法编制利润表,2014-2017连续四年的相关资料如上表所示,要求回答下列问题: ( 1 )第一年单位固定制造费用为( ) : A. 225 B. 227 C. 300 D. 180 ( 2 )第二年和第四年的单位产品成本为( ) : A. 685 B. 725 C. 680 D. 800 ( 3 )第四年销售收入为( ) : A. 290000 B. 260000 C. 27...
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