菌群失调是指（） A.肠道的正常菌群受抑制出现的一种状态 B.肠道或是其他体腔内正常

A discussion of the economic functions of money and banking produced the following statements: Statement 1: Direct exchange of commodities is less efficient than money exchange because of the search costs involved in finding an individual with whom to trade. Statement 2: The cost of funds for borrowers is lower in an economy that features depository institutions than it would be in an economy that lacked them. Are these statements correct Statement 1 Statement 2（）①A. Correct Correct ②B. Correct Incorrect ③C. Incorrect Correct

A. ①

B. ②

C. ③

EDI是通过电子方式，采用（），利用计算机网络进行结构化数据的传输和交换。

A．WORD格式 

B．超文本格式 

C．标准化格式 

D．RTF格式

（）显示剂多用于精密工件和有色金属及其合金的工件。

A、红丹粉

B、兰油

C、红墨水

D、黑墨水

电脑设备使用与保养中的“四懂三会”中的三会指什么？（）

A、会操作使用

B、会维护保养

C、会排除隐患

D、会排除故障

NS400配电子脱扣器时的额定电流有多少档？