以下程序的输出结果是( )。list_demo = [1,2,3,4,5,'abc','bef']print(list_demo[1],list_demo[5])
A. 1 5
B. 2 abc
C. 1 'abc'
D. 2 'abc'
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If I lived in the city, Itraveal in croweded buses, but Ito see lots offilms.
A. shall have to/shall be able
B. shall have to/am able
C. would have to/were able
D. would have to/would be able
有一个复杂电路,其中节点A由4条支路连接而成,I1=2A、I2=3A、A3=6A;其中I1、I2、I4都是流入节点的电流,I3是流出节点的电流。问I4的数值是()
A. 1A
B. 5A
C. 2A
D. 6A
当双活塞杆液压缸的活塞杆固定,缸体与运动件固连时,其运动件的运动范围等于液压缸有效行程的( )
A. 一倍
B. 二倍
C. 三倍