如果两个同频率的交流电的相位角,分别为φ1和 φ2,其 φ1- φ2<90 o 时,称做()。
C
暂无解析
BeforetheSmithsmovedtoNewYork,theylivedinaquiet___(neighbor)ofBoston.
垄断利润实现的途径有()
怎样认识产业结构的类型?
Thisscientistwasawardedwithseveraltitlesforhis________(accomplish)inbiology
The_(month)salaryforthepositionwillbenegotiableataround$2,000.