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【单选题】
更换电池之前,先接通可编程序控制器的交流电源约( )s,为存储器备用电源的电容器充电(电池断开后,该电容器对存储器做短时供电)。A.
3
B.
5
C.
10
D.
15
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反馈参考答案：
举一反三
【简答题】混悬剂的制备方法通常有哪几种?
【简答题】(四)阅读下面对话,根据上下文情景补全对话。 A: __1___ was Peter born? B: He was ___2__ in New York. A: __3___ does Peter’s oldest son __4___? B: He is an engineer. A: __5___ is Anne? B: She is the sister-in-law to Peter.
【单选题】Choose the correct words to complete the sentences. Prior to the 20th century, many languages with small numbers of speakers survived for centuries. The increasingly interconnected modern world makes ...
A.
preference
B.
maintenance
C.
occurrence
D.
emergence
【单选题】The words “prior to” (Para. 2) most probably mean_______.
A.
after
B.
before
C.
during
D.
beyond
【简答题】Choose the correct words to complete the sentences. Prior to the 20th century, many languages with small numbers of speakers survived for centuries. The increasingly interconnected modern world makes ...
【单选题】The words “prior to”(para.2) probably mean______.
A.
after
B.
during
C.
before
D.
beyond
【单选题】The words "prior to "(para.2) probably mean______.
A.
a.after
B.
b.during
C.
c.before
D.
d.beyond
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