()决定着矿粒按密度分层的效果。
A..水
B.风
C.大气压
D.床层运动状态
参考答案:D
English __________ in our school for almost 60 years.
A.has taught
B.was taught
C.had been taught
D.has been taught
毛果芸香碱可治疗
A.青光眼B.阵发性室上性心动过速C.有机磷酸酯类中毒D.琥珀胆碱过量中毒E.房室传导阻滞