题目内容

输出继电器只能由PLC指令来驱动,外部信号不能直接驱动PLC的输出继电器。

A. 对
B. 错

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要求：1.围绕本学期所学专题，自选角度，自拟标题，写一篇评论性或心得性小论文，字数至少1000字，要求立场正确、有观点、有条理、有逻辑；不得抄袭，如发现抄袭，则扣相应分数直至0分。2.格式规范，直接以文字形式上传学习通平台课程考试栏。

2. I ________ a few words of Turkish when I was in Istanbul.

A. picked out
B. picked off
C. picked through
D. picked up

3. His casual clothes were not appropriate ____ such occasion.

A. for
B. to
C. on
D. at

4.______ dogs donot bite.

A. barking
B. jumping
C. speaking
D. taliking