断路器的控制回路应满足下列要求之一是:应有电源监视,并宜监视跳、合闸回路的()。
A.合理性
B.适应性
C.完整性
D.选择性
参考答案:C
菱形的面积为50cm2,一个内角为30°,则其边长为______.
The microphone enabled them to keep in touch, in other words, it made it _____ for them to contact each other.
A.likely
B.capable
C.possible
D.probable