喉上神经支配的肌肉是（）
A.环杓后肌
B.杓横肌
C.杓斜肌
D.环甲肌
E.杓侧肌
参考答案：D
解析：环甲肌由喉上神经支配
—Do you know the colors of the Olympic rings?
—Yes. They're blue, yellow, black, green and red. You can find ____ one of these colors in the flags
of every country. [ ]
A. at least
B. at most
C. only
D. more than
什么是注水泵的负荷？
