电动机在起动过程中,使电动机转子能达到额定转速的条件是()。
A、电磁力矩大于阻力矩;
B、阻力矩大于电磁力矩;
C、电磁力矩等于阻力矩。
参考答案:A
按照动物行为的来源可以分为
①先天性行为②后天学习行为③防御行为④节律行为⑤印随[ ]
A.①②③
B.①③④
C.②④⑤
D.①②
.
The President said to the public, “________ hoped that people in the area will recover from the terrible earth quake soon.”
A.This is
B.There is
C.That is
D.It is