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【单选题】
8259A 中断屏蔽寄存储器的作用是 ( )
A.
禁止CPU响应外设的中断请求
B.
禁止外设向CPU发中断请求
C.
禁止软中断请求
D.
禁止NMI中断请求
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参考答案:
举一反三
【单选题】下列哪种部件不是气门组的组成部分?
A.
挺柱
B.
弹簧
C.
气门
D.
气门弹簧座
【多选题】气门组的主要组成部件有()
A.
气门
B.
弹簧
C.
锁片
D.
气门座圈
【单选题】Explain: having an extremely close friendship
A.
variable
B.
magnetic
C.
intimate
D.
sensitive
【单选题】She admitted ______ a story to explain her absence.
A.
to have made up
B.
having told
C.
to have told
D.
having made up
【判断题】气门弹簧是气门组的组成部件之一.( )
A.
正确
B.
错误
【单选题】______ over and over again, but he still couldn’t understand.
A.
Having explained
B.
Having been explained
C.
Explaining
D.
It had been explained
【单选题】She admitted _________ a story to explain the reason why she was late.
A.
to have made up
B.
having told
C.
to have told
D.
having made up
【单选题】通过低温的方法使花卉较长的时间内处于休眠状态,从而延长花期,通常处理的低温一般在().
A.
0~1℃;
B.
0~2℃;
C.
1~3℃;
D.
2~3℃
【单选题】Explain: having a good effect
A.
adequate
B.
evident
C.
sour
D.
beneficial
【单选题】the sentence , so he asked the teacher to explain it again.
A.
Not having understood
B.
As he didn’t understand
C.
Having not understood
D.
He didn’t understand
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