题目内容

The users of accounting information can be divided roughly into two groups: those who have a direct interest in the business (D); those who have indirect interest in the business (I). Write the correct letter D or I in the brackets.( ) management( ) creditors( ) investors( ) lawyers( ) brokers( ) tax authorities( ) financial press

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Match the professions in column A with the jobs in column B and write the numbers on the line.

S7-200的定时器指令有___、_ 和___ 三种分辨率，分辨率取决于定时器的编号。输入定时器号后，在定时器方框的右下角内会出现定时器的分辨率。

A. lms
B. 10ms
C. 100ms
D. 1s

S7-200的定时器指令有三种类型___、_、___。

A. TON
B. TOF
C. TONR
D. Timer

接通延时定时器TON 的使能(IN) 输入电路___（填写“接通”或“断开”）时开始定时。当前值大于等于预设值时，其定时器位变为_（填写“0”或“1”）。梯形图中其常开触点_（填写“接通”或“断开”），常闭触点___（填写“接通”或“断开”）。