【单选题】【消耗次数：1】
They are not only teachers __________ our friends
①
but for
②
but also
③
however
④
whoever
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相关题目
【单选题】
Not only ______ our money, but we were also in danger of losing our lives.
①
we lost
②
lost we
③
we did lose
④
did we lose
【单选题】
Not only the society but also the people in it ______.
①
has changed
②
have changed
③
have been changed
④
has been changed
【单选题】
Spitting on the ground is not only ______ but also harmful to others’ health.
①
blasting
②
banging
③
grabbing
④
disgusting
【判断题】
The teachers tried to __convince____ these students that they could solve the complicated problem, however, they just didn’t see the point.
①
正确
②
错误
【单选题】
Not only are cars involved in most of the traffic accidents, but they also __________to the pollution of the air. .
①
contribute
②
promote
③
refer
④
matter
【单选题】
—How many poor counties will there be in our province by 2020?—There will be only a few, if _______.
①
much
②
some
③
any
④
many
【单选题】
—How many poor counties will there be in our province by 2010?—There will be only a few, if _______.
①
much
②
some
③
any
④
many
【单选题】
Not only does Tom attend class regularly, but he also （）in extracurricular activities frequently.
①
participates
②
participate
③
involve
④
involved
随机题目
【简答题】
<img src="https://huaweicloudobs.ahjxjy.cn/D851E1F97821B00CC1E4AAF34D9E7C1D.png" title="8.png" alt="8.png"/>
【单选题】
列管换热器中用饱和蒸汽加热空气，下面两项判断是否合理，甲：传热管的壁温接近加热蒸汽的温度；乙：换热器总传热系数K接近空气侧的对流给热膜系数,说的正确的是 。
①
(a)甲合理，乙不合理
②
(b)甲不合理，乙合理
③
（c）甲乙都合理
④
(d） 甲乙都不合理
【单选题】
用一离心泵将冷却水由贮水池送至高位槽。已知高位槽液面比贮水池液面高出10m，管路总长（包括局部阻力的当量长度在内）为400m，管内径为75mm，摩擦系数为0.03。该泵的特性曲线方程为H=18-600000Q^2，式中H的单位是m，Q的单位是m/s。试求：(1) 管路特性曲线方程；(2) 泵工作时的流量和扬程。
①
H=10+418250Q^2Q=0.0028m^3/sH=10m
②
H=10+418250Q^2Q=0.0028m^3/sH=13.29m
③
H=10+258900Q^2Q=0.0042m^3/sH=10m
④
H=10+258900Q^2Q=0.0042m^3/sH=13.29m
【单选题】
下列关于温度梯度的论断中错误的是————。
①
温度梯度决定于温度场中的温度分布
②
温度场中存在温度梯度就一定存在热量的传递
③
热量传递会引起温度梯度的变化
④
热量是沿温度梯度的方向传递的
【单选题】
将一水池中20℃的水用泵输送到一敞口高位槽中，两液面之间的垂直距离为20m，泵的吸入口在水池液面上方2 m处。在某送液量下， 泵对水作功219.6J/kg，管内摩擦系数λ为0.018，吸入管路总长为40 m，压出管路总长为70m（两长度包括全部局部阻力的当量长度在内），输水管尺寸为Ф108 ×4mm，泵的效率为70%。已知20℃水的密度为1000kg/m3试求：（1）输水量，m3/h 。（2）泵的轴功率。
①
Q=43.52m^3/hN=9.45Kw
②
Q=53.72m^3/hN=3.79Kw
③
Q=43.52m^3/hN=3.79Kw
④
Q=53.72m^3/hN=9.45Kw