皮皮学,免费搜题
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搜题
【单选题】
当电梯轿厢分别在上下两端站平层位置,轿厢(或对重)底部撞板与液压缓冲器顶面的垂直距离( )mm。
A.
50~300
B.
100~350
C.
150~400
D.
200~450
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举一反三
【单选题】I know the boy _____ the teacher. [     ]
A.
at
B.
in
C.
under
D.
behind
【单选题】I know the boy ______ Tom.
A.
name
B.
named
C.
naming
D.
names
【单选题】I know the boy, ____mother is a teacher.
A.
whose
B.
his
C.
whom
D.
who
【单选题】I know the boy very well. I have seen him____up from childhood.
A.
grow
B.
grew
C.
was growing
D.
to grow
【判断题】昼夜温差大不利于果实糖分积累,从而影响果实品质。( )
A.
正确
B.
错误
【简答题】I know the boy____eyes are blue.
【简答题】I know the boy parents are dead.
【单选题】I know the boy that ______in No. 1 Middle school. [     ]
A.
studies
B.
study
C.
is studying
D.
does not study
【单选题】I know the boy__________parents are dead.
A.
which
B.
who
C.
whose
【单选题】现有一 PLC模块,其型号为FX2N-48MR,下列说法正确的是( )
A.
该模块为 PLC输入输出扩展模块
B.
该模块内集中了 PLC和存储器以及部分I/O接口。
C.
该模块含有 48个输入端子
D.
该模块为模拟量输出模块。