向两台电动机供电的电缆,流过电缆的电流取最大一台电动机的额定电流,就是电缆长时允许电流。
参考答案:错
When did a mass move to the suburbs begin in the U.S.
A.In the 1960s.
B.In the 1940s.
C.In the 1970s.
D.In the 1950s.
一个生物样品的含氮量为5%,它的蛋白质含量正确的是()。
A.38.0%
B.8.80%
C.16.0%
D.12.50%
E.31.25%