1972年2月,国务院 * * 周恩来陪同美国总统()访问杭州市西湖区梅家坞龙井茶区,周 * * 一生嗜茶,曾5次视察龙井茶区,这是他生前最后一次访问梅家坞。
参考答案:尼克松
PLC输入模块的故障处理方法正确的是()。①有输入信号但是输入模块指示灯不亮时应检查是不是输入直流电源的正负极接反②若一个LED逻辑指示灯变暗,而且根据编程器件监视器,处理器未识别输入,则输入模块可能存在故障③指示器不亮,万用表检查有电压,直接说明输入模块烧毁了④出现输入故障时,首先检查LED电源指示灯是否响应现场元件(如按钮、行程开关等)
A、①②③
B、②③④
C、①②④
D、①③④
单句改错。
在错的词下划一横线,在该行右边横线上写出改正后的词(每句均有一个错误)。
1. What the earth travels around the sun is known to us all. 1. ______
2. The ruler that he bought yesterday was lain on the table. 2._______
3. He returned in the afternoon of his birthday. 3. _______
4. He spoke too rapidly that we couldn't clearly understand him. 4. _______
5. He shouldn't have gone abroad, for I saw him in the part this morning. 5. _______