问题
单项选择题
由于系统的规模不同，各行业对PLC大、中、小型的划分也不尽一致。在石油化工行业中，1024点属于（）
A、小型PLC
B、中型PLC
C、大型PLC
D、超大PLC
答案
参考答案：B
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由于系统的规模不同，各行业对PLC大、中、小型的划分也不尽一致。在石油化工行业中，1024点属于（）
A、小型PLC
B、中型PLC
C、大型PLC
D、超大PLC
参考答案：B
| 综合填空，选择所给单词并用其适当形式填空。 | |
manners. It's 1______ to follow them. When you sit down at the table, take your napkin and 2______ it on your lap. The dinner always 3______ with a small dish. When you start eating, you should keep the fork in your 4______ hand. It's polite to finish 5______ everything on your plate, so don't take 6______ food than you need. Maybe you don't know whether it's polite or not to speak loudly at the table. The answer is that you should speak 7______ and smile a lot. When you drink to 8______, you'd better raise your glass and take only a sip. Remember not 9______ too much. If you can't remember these 10______. Just do as other people do. |