氯胺酮的主要不良反应是
A.抑制循环B.喉痉挛C.肝毒性D.精神运动性反应E.局部刺激性
参考答案:D
Jack wasn’t saying anything, but the teacher smiled at him _______he had done something very clever.
A.as if
B.now that
C.while
D.though
泵站的设计流量就是在某一设计保证率下,农作物所需的()灌水流量。
A.最小
B.最大
C.中间