选择题:1. Which of the following mistakes are parents lik

题目内容:
1. Which of the following mistakes are parents likely to make according to the passage?
A) To neglect their child’s education.
B) To expect too much of their child.
C) To make their child become a musician.
D) To help their child to be a genius.
参考答案:

为了保证隧道正常运营和安全,路堑侧沟的水不得流经隧道排出。×√

为了保证隧道正常运营和安全,路堑侧沟的水不得流经隧道排出。×√

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焊接工字形外伸梁,受力及几何尺寸如图所示,已知截面对形心轴的惯性矩Iz=11.512×106mm4,

焊接工字形外伸梁,受力及几何尺寸如图所示,已知截面对形心轴的惯性矩Iz=11.512×106mm4,材料的许用正应力[s]=160MPa,许用切应力[t]=10

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图示任意图形的面积为A,形心C到z轴的距离为a。设其对z轴的静矩为Sz,惯性矩为Iz,则 。、

图示任意图形的面积为A,形心C到z轴的距离为a。设其对z轴的静矩为Sz,惯性矩为Iz,则 。、 Sz=Aa,Iz=Aa2; B、 Sz=Aa,Iz≠Aa2

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晶闸管两端并联一个RC电路的作用是

晶闸管两端并联一个RC电路的作用是 A.分流 B.降压 C.过电压保护 D.过电压保护

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关于图纸幅面,以下说法正确的是( )A.长边短边一般都可以加长B.长边短边一般都不应加长C.长边一

关于图纸幅面,以下说法正确的是( )A.长边短边一般都可以加长B.长边短边一般都不应加长C.长边一般不应加长,短边可以加长D.短边一般不应加长,长边可以加长

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