串励式直流电机式（）和（）串联。
参考答案：励磁绕组；电枢绕组
土耳其海峡沟通的海洋是 [ ]
A．阿拉伯海和红海
B．地中海和大西洋
C．黑海和地中海
D．黑海和地中海
He was _____ tired _____ he fell asleep as soon as he lay down. Oh, we can go out and let him have a
good rest. [ ]
A. too, to
B. so, that
C. enough, to
D. such, that
