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【单选题】
PLC机的扫描周期与程序的、( )及所用指令的执行时间有关。A.
辅助继电路
B.
计数器
C.
计时器
D.
时钟频率
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举一反三
【简答题】Today we learned database, but we still don't understand the concept.
【简答题】What are the three elements of marketing mix we learned today? The three elements of marketing mix we learned today are ___________, ___________ and ____________.
【简答题】What is the main idea of the text we learned today?
【简答题】商业银行的经营原则是（ ）。
【简答题】What speech figures have we learned today? __________, __________.
【单选题】What have we learned today?
A.
We have learned about how to greet people in different cultures
B.
We have learned about how to shop for things.
C.
We have learned about how to introduce favorite food.
D.
We have learned about how to introduce festival.
【单选题】How many speculations on the origin of language we learned in today's class?
A.
1
B.
2
C.
3
D.
4
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