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【多选题】
肺泡表面活性物质A.
由肺泡I型上皮细胞分泌
B.
由肺泡Ⅱ型上皮细胞分泌
C.
可以降低肺泡表面张力
D.
是脂蛋白混合物
E.
可以防止液体渗入肺泡内
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举一反三
【单选题】根据病虫发生消长规律，对影响病虫发生的多种因素进行调查，取样数据结合历史资料和( )，进行分析估计的过程称为预测。
A.
虫情预报
B.
病情预报
C.
损失估计
D.
气象预报
【单选题】You be hungry after the long walk. Help yourself to some cakes.
A.
should
B.
must
C.
need to
D.
ought to
【多选题】关于发动机冷却系统,下列说法正确的是( )。
A.
汽车发动机常见的冷却方式有风冷和水冷两种
B.
现代轿车采用防冻液，以提高冷却液的防冻和防沸腾的能力
C.
发动机冷却液缺少时，可添加井水
D.
防冻液的沸点可在160℃以上
【单选题】听力原文： At the University of Kansas art museum, investigators tested the effects of different colored walls on two groups of visitors. For the first group the room was painted white for the second, dark...
A.
At the University of Kansas.
B.
At the University of Kansas art museum.
C.
At an art museum.
D.
In an office.
【单选题】关于新嘉年华的冷却系统下列说法正确的是？（）
A.
冷却风扇是由风扇模块控制的，所以风扇的转速可根据水温的高低变化而连续变化
B.
采用的是电子式节温器
C.
当ECT传感器故障时冷却风扇会停止运转
D.
由水温警示灯取代了水温表，当发动机水温高于120℃时，水温警示灯会点亮
【单选题】One of the great changes brought about by the knowledge society is that ______.
A.
the difference between the employee and the employer has become insignificant
B.
people have to change their jobs from time to time
C.
most people have to take part-time jobs
D.
people's traditional concepts about work no longer hold true
【单选题】In the last paragraph, the author's attitude is that________.
A.
different people have different ideas
B.
however difficult the situation is, people should unite and move forward
C.
people should go back to work immediately
D.
people shouldn't walk with expressionless faces
【多选题】关于发动机冷却系统,下列说法正确的是( )。
A.
汽车发动机强制水冷系常用离心式水泵
B.
节温器用来调节冷却强度，保证发动机在最适宜的温度下工作
C.
节温器是通过ECU来控制其开闭的
D.
节温器的工作温度一般大于85℃
【单选题】One of the great changes brought about by the knowledge society is that ______.
A.
the difference between the employee and the employer has become insignificant
B.
people's traditional concepts about work no longer hold true
C.
most people have to take part-time jobs
D.
people have to change their jobs from time to time
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