单项选择题

2.平面力系，若力多边形中诸力矢首尾相接，自行闭合，则说明该力系平衡。
A、正确
B、错误

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单项选择题

Whichof the following statements about the balance of payments is nottrue?
A、TheBOP is the summary statement of all international transactionsbetween one country and all other countries.
B、TheBOP is a flow statement, summarizing all international transactionsthat occur across the geographic borders over a period of time,typically a year.
C、Althoughthe BOP must always balance in theory, in practice there aresubstantial imbalances as a result of statistical errors andmisreporting of current account and financial account flows.
D、Allof the above are true.

单项选择题

ping扫描同一网段内的存活电脑，并且保存结果的批处理命令是哪一个？
A、for /l %i in (100,1,108) do ping 192.168.0.%i -n 2 -w 100
B、for /l %i in (100,1,108) do ping 192.168.0.%i -n 2 -w 100|findstr “TTL” >>d:\ping.txt
C、for /p %i in (100,1,108) do ping 192.168.0.%i -n 2 -w 100
D、for /p %i in (100,1,108) do ping 192.168.0.%i -n 2 -w 100|findstr “TTL” >>d:\ping.txt