【单选题】【消耗次数：1】
荧光灯的镇流器从启动到工作的过程中起的作用是（??）。
①
稳压
②
限流
③
产生瞬时高压
④
节省电能
参考答案：
复制
纠错
相关题目
【单选题】
水准测量过程中水准尺的主要作用是（ ）。
①
提供水准点或转点到视线的铅垂距离
②
提供水准点或转点到水准仪的视距
③
提供水准点或转点到视线的倾斜距离
④
提供水准路线的视距
随机题目
【单选题】
Your proposal （） by the committee soon.
①
is discussed
②
has been discussed
③
is going to be discussed
④
will have been discussed
【单选题】
There are some areas which are still densely populated ____ their severe weather conditions.
①
due to
②
with regard to
③
regardless of
④
but for
【单选题】
We all thought ______ pity that you were unable to attend our meeting.
①
that
②
which
③
this
④
it
【单选题】
The shy girl felt ____ and uncomfortable when she could not answer her teacher’s questions.
①
amazed
②
awkward
③
curious
④
amused
【单选题】
Free ______ of shampoo is distributed from door to door.
①
sample
②
example
③
product
④
stock
【单选题】
A police officer claimed he had attempted to _______ paying his fare.
①
avoid
②
reject
③
refuse
④
neglect
【单选题】
He is late again today. I’ll ____ that he will not be late tomorrow.
①
refer to it
②
look to him
③
see to it
④
turn to it
【单选题】
Must I take a taxi?No, you _______. You can take my car.
①
had better to
②
don’t
③
must not
④
don’t have to
【单选题】
So clear was his _____ of the case that others had no more to say.
①
attitude
②
presentation
③
comment
④
remark
【单选题】
When Lily came home at 5 p.m. yesterday, her mother ______ dinner in the kitchen.
①
cooked
②
was cooking
③
cooks
④
has cooked