【单选题】_______ five by two. The product is ten.
【简答题】Two plus/and three equals/equal five.
【单选题】Sy-seven thirty-five is forty-two.
【单选题】Before charging a refrigeration unit, the refrigerant charging lines should be .
A.
flushed with clean refrigerant oil
B.
purged with the refrigerant
C.
washed with an ammonia and alcohol solution
D.
grounded to compressor
【简答题】电力变压器并列运行的条件是______、______和______。
【判断题】计算单自由度体系受迫振动的最大动位移式子 y max = b y st 中, y st 是质量 m 的重量所引起的静位移。
【简答题】“Two plus two equals five”is a slogan used in the novel of 1984 as an example of , similar to other obviously false slogans by the Party in the novel.
【简答题】删除整个集合使用命令_____________。
【简答题】电力变压器的并列运行条件 ? (1)并列变压器的额定一次电压和二次电压必须对应相等(即:变压器的电压比必须相同) (2)所有并列变压器的阻抗电压(即 短路电压)必须相等 (3)所有并列变压器的连接组别必须相同