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【判断题】
在化学纤维的命名方法中,我们把人造纤维的短纤维一般在其简称后加“纤”字,如粘胶纤维简称“粘纤”A.
正确
B.
错误
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【简答题】《孙子兵法》的主要思想有哪些？
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【单选题】Different? Because sometimes it can be hard to pinpoint a __4__harm. “Internet addiction can also be called technology addiction. Taking selfies, using mobile phones are different aspects of this. Thi...
A.
actually
B.
specific
C.
model
D.
overuse
E.
thoroughly
F.
negative
G.
nation
H.
significant
I.
monitor
J.
positive K. vulnerable L. physical
【单选题】Many sentences used to describe monetary policy, such as 'steering the economy to a soft landing' or 'a touch on the brakes', makes it sound like a precise science. Nothing could be further from the t...
A.
is comparable to driving a car.
B.
is similar to carrying out scientific work.
C.
will not influence the economy immediately.
D.
will have an immediate impact on the inflation rate.
【单选题】下列关于肝细胞腺瘤的叙述，错误的是
A.
多为单发
B.
病理上是由正常或其高度不典型增生的肝细胞、血管及胆管构成
C.
MRI信号复杂，与其病变易出血坏死、脂肪积聚有关
D.
肿瘤中央可见纤维瘢痕
E.
注射Dd-DTPA后，肿瘤明显异常强化
【简答题】如图6-32所示液压系统，溢流阀调定压力为5MPa，减压阀调定压为1．5MPa，试分析活塞运动期间和碰到挡铁后，系统中A、B两点压力的变化情况。
【简答题】在图8-2所示的液压系统中，液压缸负载为F L ，液压缸无杆腔有效面积为A，减压阀的调定压力为P j ；溢流阀的调定压力为P y ，P y ＞P j 。试分析泵的工作压力由什么值来确定?
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