主减速器的功能是升速降矩。
参考答案：错
毒扁豆碱是一种非特异性苏醒药，目前可用毒扁豆碱对抗的药物包括抗组胺药和抗震颤性麻痹药。
The buses, most of _________ were already full, were surrounded by an angry crowd.
A．that
B．it
C．them
D．which
