麻醉前用药的目的是()
A.缓解或解除术前疼痛
B.减少不良的神经反射
C.使病人情绪安定而合作
D.减少口腔及呼吸道分泌物
E.以上都是
参考答案:E
Jane was disappointed that most of the guests ______when she _______ at the party.
A.left; had arrived
B.left; arrived
C.had left; had arrived
D.had left; arrived
井下行驶车辆之间的距离应保持在()以上。
A、3
B、10
C、30