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【多选题】
下列元素在钢材中哪些是有害成分?A.
氧
B.
锰
C.
磷
D.
硫
E.
硅
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【单选题】I know Jonathan quite well and never doubt ______ he can do a good job of it.
A.
whether
B.
that
C.
when
D.
what
【简答题】奥兹莫比尔是 ____汽车公司的品牌。
【单选题】It’s good to know _____ the dogs will be well cared for while we’re away.
A.
what
B.
whose
C.
which
D.
that
【单选题】Are you a good reader? Good readers know that reading isn't just about knowing words— it's a way of thinking. Here are some tips that may be of some help. Think before you read. Before you read the te...
A.
a newspaper for general readers
B.
a magazine for language teachers
C.
a book for language learners
D.
an advertisement for a new book
【简答题】梯形图编程的基本规则
【多选题】梯形图的编程基本规则()
A.
PLC内部元器件触点的使用次数是无限制的
B.
触点不能放在线圈的右边
C.
输出线圈不能串联
D.
应尽量采用“左大右小，上大下小”，可节省指令
E.
应尽量节省指令（少用进栈出栈）
【简答题】采用梯形图编程的基本规则是什么?
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