【单选题】【消耗次数：1】
汽车行驶时，空气阻力所消耗的功率（ ）
①
与车速成正比
②
与车速的平方成正比
③
与车速的3次方成正比
④
与车速的4次方成正比
参考答案：
复制
纠错
相关题目
【判断题】
液流流经薄壁小孔的流量与 小孔通流面积 的一次方成正比，与 压力差 的1/2次方成正比。通过小孔的流量对 温度 不敏感，因此薄壁小孔常用作可调节流阀。
①
正确
②
错误
【判断题】
通过固定平行平板缝隙的流量与 压力 一次方成正比，与 间隙 的三次方成正比，这说明液压元件内的 配合间隙 的大小对其泄漏量的影响非常大。滑阀的中位机是能三位滑阀在中位时各油口的连通方式，它体现了换向阀的控制机能。
①
正确
②
错误
随机题目
【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
【单选题】
Our customers are complaining of the ______ quality of our products.
①
gracious
②
wonderful
③
superior
④
inferior